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-x^3-3*x^2+14*x+28=0 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
   3      2                
- x  - 3*x  + 14*x + 28 = 0
$$\left(14 x + \left(- x^{3} - 3 x^{2}\right)\right) + 28 = 0$$
Teorema de Cardano-Vieta
reescribamos la ecuación
$$\left(14 x + \left(- x^{3} - 3 x^{2}\right)\right) + 28 = 0$$
de
$$a x^{3} + b x^{2} + c x + d = 0$$
como ecuación cúbica reducida
$$x^{3} + \frac{b x^{2}}{a} + \frac{c x}{a} + \frac{d}{a} = 0$$
$$x^{3} + 3 x^{2} - 14 x - 28 = 0$$
$$p x^{2} + q x + v + x^{3} = 0$$
donde
$$p = \frac{b}{a}$$
$$p = 3$$
$$q = \frac{c}{a}$$
$$q = -14$$
$$v = \frac{d}{a}$$
$$v = -28$$
Fórmulas de Cardano-Vieta
$$x_{1} + x_{2} + x_{3} = - p$$
$$x_{1} x_{2} + x_{1} x_{3} + x_{2} x_{3} = q$$
$$x_{1} x_{2} x_{3} = v$$
$$x_{1} + x_{2} + x_{3} = -3$$
$$x_{1} x_{2} + x_{1} x_{3} + x_{2} x_{3} = -14$$
$$x_{1} x_{2} x_{3} = -28$$
Gráfica
Respuesta rápida [src]
               /                  1                   \     /     /                  1                   \                                                            \                                                            
          17*re|--------------------------------------|     |17*im|--------------------------------------|             /    /  _______\\             /    /  _______\\|             /    /  _______\\             /    /  _______\\
               |     _________________                |     |     |     _________________                |             |    |\/ 11823 ||             |    |\/ 11823 |||             |    |\/ 11823 ||             |    |\/ 11823 ||
               |    /         _______  /          ___\|     |     |    /         _______  /          ___\|             |atan|---------||             |atan|---------|||             |atan|---------||             |atan|---------||
               |   /      I*\/ 11823   |  1   I*\/ 3 ||     |     |   /      I*\/ 11823   |  1   I*\/ 3 ||     ____    |    \    54   /|     ____    |    \    54   /||     ____    |    \    54   /|     ____    |    \    54   /|
               |3 /   6 + ----------- *|- - - -------||     |     |3 /   6 + ----------- *|- - - -------||   \/ 17 *cos|---------------|   \/ 51 *sin|---------------||   \/ 17 *sin|---------------|   \/ 51 *cos|---------------|
               \\/             9       \  2      2   //     |     \\/             9       \  2      2   //             \       3       /             \       3       /|             \       3       /             \       3       /
x1 = -1 + --------------------------------------------- + I*|--------------------------------------------- - --------------------------- - ---------------------------| + --------------------------- - ---------------------------
                                3                           \                      3                                      2                             6             /                2                             6             
$$x_{1} = - \frac{\sqrt{51} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} - 1 + \frac{17 \operatorname{re}{\left(\frac{1}{\left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} + \frac{\sqrt{17} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2} + i \left(- \frac{\sqrt{17} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2} - \frac{\sqrt{51} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} + \frac{17 \operatorname{im}{\left(\frac{1}{\left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3}\right)$$
               /                  1                   \     /     /                  1                   \                                                            \                                                            
          17*re|--------------------------------------|     |17*im|--------------------------------------|             /    /  _______\\             /    /  _______\\|             /    /  _______\\             /    /  _______\\
               |     _________________                |     |     |     _________________                |             |    |\/ 11823 ||             |    |\/ 11823 |||             |    |\/ 11823 ||             |    |\/ 11823 ||
               |    /         _______  /          ___\|     |     |    /         _______  /          ___\|             |atan|---------||             |atan|---------|||             |atan|---------||             |atan|---------||
               |   /      I*\/ 11823   |  1   I*\/ 3 ||     |     |   /      I*\/ 11823   |  1   I*\/ 3 ||     ____    |    \    54   /|     ____    |    \    54   /||     ____    |    \    54   /|     ____    |    \    54   /|
               |3 /   6 + ----------- *|- - + -------||     |     |3 /   6 + ----------- *|- - + -------||   \/ 17 *cos|---------------|   \/ 51 *sin|---------------||   \/ 17 *sin|---------------|   \/ 51 *cos|---------------|
               \\/             9       \  2      2   //     |     \\/             9       \  2      2   //             \       3       /             \       3       /|             \       3       /             \       3       /
x2 = -1 + --------------------------------------------- + I*|--------------------------------------------- + --------------------------- - ---------------------------| - --------------------------- - ---------------------------
                                3                           \                      3                                      2                             6             /                2                             6             
$$x_{2} = \frac{17 \operatorname{re}{\left(\frac{1}{\left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} - \frac{\sqrt{51} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} - 1 - \frac{\sqrt{17} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2} + i \left(\frac{17 \operatorname{im}{\left(\frac{1}{\left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} - \frac{\sqrt{51} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} + \frac{\sqrt{17} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2}\right)$$
               _________________                           
              /         _______                            
             /      I*\/ 11823                17           
x3 = -1 + 3 /   6 + -----------  + ------------------------
          \/             9                _________________
                                         /         _______ 
                                        /      I*\/ 11823  
                                   3*3 /   6 + ----------- 
                                     \/             9      
$$x_{3} = -1 + \frac{17}{3 \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}} + \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}$$
x3 = -1 + 17/(3*(6 + sqrt(11823)*i/9)^(1/3)) + (6 + sqrt(11823)*i/9)^(1/3)
Suma y producto de raíces [src]
suma
          /                  1                   \     /     /                  1                   \                                                            \                                                                         /                  1                   \     /     /                  1                   \                                                            \                                                                                                                     
     17*re|--------------------------------------|     |17*im|--------------------------------------|             /    /  _______\\             /    /  _______\\|             /    /  _______\\             /    /  _______\\        17*re|--------------------------------------|     |17*im|--------------------------------------|             /    /  _______\\             /    /  _______\\|             /    /  _______\\             /    /  _______\\                                                         
          |     _________________                |     |     |     _________________                |             |    |\/ 11823 ||             |    |\/ 11823 |||             |    |\/ 11823 ||             |    |\/ 11823 ||             |     _________________                |     |     |     _________________                |             |    |\/ 11823 ||             |    |\/ 11823 |||             |    |\/ 11823 ||             |    |\/ 11823 ||                                                         
          |    /         _______  /          ___\|     |     |    /         _______  /          ___\|             |atan|---------||             |atan|---------|||             |atan|---------||             |atan|---------||             |    /         _______  /          ___\|     |     |    /         _______  /          ___\|             |atan|---------||             |atan|---------|||             |atan|---------||             |atan|---------||                                                         
          |   /      I*\/ 11823   |  1   I*\/ 3 ||     |     |   /      I*\/ 11823   |  1   I*\/ 3 ||     ____    |    \    54   /|     ____    |    \    54   /||     ____    |    \    54   /|     ____    |    \    54   /|             |   /      I*\/ 11823   |  1   I*\/ 3 ||     |     |   /      I*\/ 11823   |  1   I*\/ 3 ||     ____    |    \    54   /|     ____    |    \    54   /||     ____    |    \    54   /|     ____    |    \    54   /|             _________________                           
          |3 /   6 + ----------- *|- - - -------||     |     |3 /   6 + ----------- *|- - - -------||   \/ 17 *cos|---------------|   \/ 51 *sin|---------------||   \/ 17 *sin|---------------|   \/ 51 *cos|---------------|             |3 /   6 + ----------- *|- - + -------||     |     |3 /   6 + ----------- *|- - + -------||   \/ 17 *cos|---------------|   \/ 51 *sin|---------------||   \/ 17 *sin|---------------|   \/ 51 *cos|---------------|            /         _______                            
          \\/             9       \  2      2   //     |     \\/             9       \  2      2   //             \       3       /             \       3       /|             \       3       /             \       3       /             \\/             9       \  2      2   //     |     \\/             9       \  2      2   //             \       3       /             \       3       /|             \       3       /             \       3       /           /      I*\/ 11823                17           
-1 + --------------------------------------------- + I*|--------------------------------------------- - --------------------------- - ---------------------------| + --------------------------- - --------------------------- + -1 + --------------------------------------------- + I*|--------------------------------------------- + --------------------------- - ---------------------------| - --------------------------- - --------------------------- + -1 + 3 /   6 + -----------  + ------------------------
                           3                           \                      3                                      2                             6             /                2                             6                                           3                           \                      3                                      2                             6             /                2                             6                     \/             9                _________________
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      /         _______ 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     /      I*\/ 11823  
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                3*3 /   6 + ----------- 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  \/             9      
$$\left(-1 + \frac{17}{3 \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}} + \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}\right) + \left(\left(- \frac{\sqrt{51} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} - 1 + \frac{17 \operatorname{re}{\left(\frac{1}{\left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} + \frac{\sqrt{17} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2} + i \left(- \frac{\sqrt{17} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2} - \frac{\sqrt{51} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} + \frac{17 \operatorname{im}{\left(\frac{1}{\left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3}\right)\right) + \left(\frac{17 \operatorname{re}{\left(\frac{1}{\left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} - \frac{\sqrt{51} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} - 1 - \frac{\sqrt{17} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2} + i \left(\frac{17 \operatorname{im}{\left(\frac{1}{\left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} - \frac{\sqrt{51} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} + \frac{\sqrt{17} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2}\right)\right)\right)$$
=
                                                              /                  1                   \        /                  1                   \     /     /                  1                   \                                                            \     /     /                  1                   \                                                            \                              
                                                         17*re|--------------------------------------|   17*re|--------------------------------------|     |17*im|--------------------------------------|             /    /  _______\\             /    /  _______\\|     |17*im|--------------------------------------|             /    /  _______\\             /    /  _______\\|             /    /  _______\\
                                                              |     _________________                |        |     _________________                |     |     |     _________________                |             |    |\/ 11823 ||             |    |\/ 11823 |||     |     |     _________________                |             |    |\/ 11823 ||             |    |\/ 11823 |||             |    |\/ 11823 ||
                                                              |    /         _______  /          ___\|        |    /         _______  /          ___\|     |     |    /         _______  /          ___\|             |atan|---------||             |atan|---------|||     |     |    /         _______  /          ___\|             |atan|---------||             |atan|---------|||             |atan|---------||
          _________________                                   |   /      I*\/ 11823   |  1   I*\/ 3 ||        |   /      I*\/ 11823   |  1   I*\/ 3 ||     |     |   /      I*\/ 11823   |  1   I*\/ 3 ||     ____    |    \    54   /|     ____    |    \    54   /||     |     |   /      I*\/ 11823   |  1   I*\/ 3 ||     ____    |    \    54   /|     ____    |    \    54   /||     ____    |    \    54   /|
         /         _______                                    |3 /   6 + ----------- *|- - + -------||        |3 /   6 + ----------- *|- - - -------||     |     |3 /   6 + ----------- *|- - + -------||   \/ 17 *cos|---------------|   \/ 51 *sin|---------------||     |     |3 /   6 + ----------- *|- - - -------||   \/ 17 *cos|---------------|   \/ 51 *sin|---------------||   \/ 51 *cos|---------------|
        /      I*\/ 11823                17                   \\/             9       \  2      2   //        \\/             9       \  2      2   //     |     \\/             9       \  2      2   //             \       3       /             \       3       /|     |     \\/             9       \  2      2   //             \       3       /             \       3       /|             \       3       /
-3 + 3 /   6 + -----------  + ------------------------ + --------------------------------------------- + --------------------------------------------- + I*|--------------------------------------------- + --------------------------- - ---------------------------| + I*|--------------------------------------------- - --------------------------- - ---------------------------| - ---------------------------
     \/             9                _________________                         3                                               3                           \                      3                                      2                             6             /     \                      3                                      2                             6             /                3             
                                    /         _______                                                                                                                                                                                                                                                                                                                                                               
                                   /      I*\/ 11823                                                                                                                                                                                                                                                                                                                                                                
                              3*3 /   6 + -----------                                                                                                                                                                                                                                                                                                                                                               
                                \/             9                                                                                                                                                                                                                                                                                                                                                                    
$$-3 - \frac{\sqrt{51} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{3} + \frac{17 \operatorname{re}{\left(\frac{1}{\left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} + \frac{17 \operatorname{re}{\left(\frac{1}{\left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} + \frac{17}{3 \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}} + i \left(\frac{17 \operatorname{im}{\left(\frac{1}{\left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} - \frac{\sqrt{51} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} + \frac{\sqrt{17} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2}\right) + i \left(- \frac{\sqrt{17} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2} - \frac{\sqrt{51} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} + \frac{17 \operatorname{im}{\left(\frac{1}{\left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3}\right) + \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}$$
producto
/          /                  1                   \     /     /                  1                   \                                                            \                                                            \ /          /                  1                   \     /     /                  1                   \                                                            \                                                            \                                                         
|     17*re|--------------------------------------|     |17*im|--------------------------------------|             /    /  _______\\             /    /  _______\\|             /    /  _______\\             /    /  _______\\| |     17*re|--------------------------------------|     |17*im|--------------------------------------|             /    /  _______\\             /    /  _______\\|             /    /  _______\\             /    /  _______\\|                                                         
|          |     _________________                |     |     |     _________________                |             |    |\/ 11823 ||             |    |\/ 11823 |||             |    |\/ 11823 ||             |    |\/ 11823 ||| |          |     _________________                |     |     |     _________________                |             |    |\/ 11823 ||             |    |\/ 11823 |||             |    |\/ 11823 ||             |    |\/ 11823 |||                                                         
|          |    /         _______  /          ___\|     |     |    /         _______  /          ___\|             |atan|---------||             |atan|---------|||             |atan|---------||             |atan|---------||| |          |    /         _______  /          ___\|     |     |    /         _______  /          ___\|             |atan|---------||             |atan|---------|||             |atan|---------||             |atan|---------|||                                                         
|          |   /      I*\/ 11823   |  1   I*\/ 3 ||     |     |   /      I*\/ 11823   |  1   I*\/ 3 ||     ____    |    \    54   /|     ____    |    \    54   /||     ____    |    \    54   /|     ____    |    \    54   /|| |          |   /      I*\/ 11823   |  1   I*\/ 3 ||     |     |   /      I*\/ 11823   |  1   I*\/ 3 ||     ____    |    \    54   /|     ____    |    \    54   /||     ____    |    \    54   /|     ____    |    \    54   /|| /          _________________                           \
|          |3 /   6 + ----------- *|- - - -------||     |     |3 /   6 + ----------- *|- - - -------||   \/ 17 *cos|---------------|   \/ 51 *sin|---------------||   \/ 17 *sin|---------------|   \/ 51 *cos|---------------|| |          |3 /   6 + ----------- *|- - + -------||     |     |3 /   6 + ----------- *|- - + -------||   \/ 17 *cos|---------------|   \/ 51 *sin|---------------||   \/ 17 *sin|---------------|   \/ 51 *cos|---------------|| |         /         _______                            |
|          \\/             9       \  2      2   //     |     \\/             9       \  2      2   //             \       3       /             \       3       /|             \       3       /             \       3       /| |          \\/             9       \  2      2   //     |     \\/             9       \  2      2   //             \       3       /             \       3       /|             \       3       /             \       3       /| |        /      I*\/ 11823                17           |
|-1 + --------------------------------------------- + I*|--------------------------------------------- - --------------------------- - ---------------------------| + --------------------------- - ---------------------------|*|-1 + --------------------------------------------- + I*|--------------------------------------------- + --------------------------- - ---------------------------| - --------------------------- - ---------------------------|*|-1 + 3 /   6 + -----------  + ------------------------|
\                           3                           \                      3                                      2                             6             /                2                             6             / \                           3                           \                      3                                      2                             6             /                2                             6             / |     \/             9                _________________|
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                    /         _______ |
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                                   /      I*\/ 11823  |
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |                              3*3 /   6 + ----------- |
                                                                                                                                                                                                                                                                                                                                                                                                                                                                  \                                \/             9      /
$$\left(- \frac{\sqrt{51} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} - 1 + \frac{17 \operatorname{re}{\left(\frac{1}{\left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} + \frac{\sqrt{17} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2} + i \left(- \frac{\sqrt{17} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2} - \frac{\sqrt{51} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} + \frac{17 \operatorname{im}{\left(\frac{1}{\left(- \frac{1}{2} - \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3}\right)\right) \left(\frac{17 \operatorname{re}{\left(\frac{1}{\left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} - \frac{\sqrt{51} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} - 1 - \frac{\sqrt{17} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2} + i \left(\frac{17 \operatorname{im}{\left(\frac{1}{\left(- \frac{1}{2} + \frac{\sqrt{3} i}{2}\right) \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}}\right)}}{3} - \frac{\sqrt{51} \sin{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{6} + \frac{\sqrt{17} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}}{2}\right)\right) \left(-1 + \frac{17}{3 \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}} + \sqrt[3]{6 + \frac{\sqrt{11823} i}{9}}\right)$$
=
                                                                  /              /      /  _______\\                /    /  _______\\\
                                                                  |              |      |\/ 11823 ||                |    |\/ 11823 |||
/             __________________ /        _____________________\\ |              |2*atan|---------||                |atan|---------|||
|    2/3   3 /          _______  |     3 /             _______ || |              |      \    54   /|        ____    |    \    54   /||
\17*3    + \/  54 + I*\/ 11823  *\-3 + \/  162 + 3*I*\/ 11823  //*|-168 + 408*cos|-----------------| + 24*\/ 51 *cos|---------------||
                                                                  \              \        3        /                \       3       //
--------------------------------------------------------------------------------------------------------------------------------------
                                                             __________________                                                       
                                                          3 /          _______                                                        
                                                      108*\/  54 + I*\/ 11823                                                         
$$\frac{\left(17 \cdot 3^{\frac{2}{3}} + \left(-3 + \sqrt[3]{162 + 3 \sqrt{11823} i}\right) \sqrt[3]{54 + \sqrt{11823} i}\right) \left(-168 + 24 \sqrt{51} \cos{\left(\frac{\operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)} + 408 \cos{\left(\frac{2 \operatorname{atan}{\left(\frac{\sqrt{11823}}{54} \right)}}{3} \right)}\right)}{108 \sqrt[3]{54 + \sqrt{11823} i}}$$
(17*3^(2/3) + (54 + i*sqrt(11823))^(1/3)*(-3 + (162 + 3*i*sqrt(11823))^(1/3)))*(-168 + 408*cos(2*atan(sqrt(11823)/54)/3) + 24*sqrt(51)*cos(atan(sqrt(11823)/54)/3))/(108*(54 + i*sqrt(11823))^(1/3))
Respuesta numérica [src]
x1 = 3.43885143209577
x2 = -1.72863784621664
x3 = -4.71021358587913
x3 = -4.71021358587913