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x^3-3*x^2-4=0

x^3-3*x^2-4=0 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
 3      2        
x  - 3*x  - 4 = 0
$$\left(x^{3} - 3 x^{2}\right) - 4 = 0$$
Teorema de Cardano-Vieta
es ecuación cúbica reducida
$$p x^{2} + q x + v + x^{3} = 0$$
donde
$$p = \frac{b}{a}$$
$$p = -3$$
$$q = \frac{c}{a}$$
$$q = 0$$
$$v = \frac{d}{a}$$
$$v = -4$$
Fórmulas de Cardano-Vieta
$$x_{1} + x_{2} + x_{3} = - p$$
$$x_{1} x_{2} + x_{1} x_{3} + x_{2} x_{3} = q$$
$$x_{1} x_{2} x_{3} = v$$
$$x_{1} + x_{2} + x_{3} = 3$$
$$x_{1} x_{2} + x_{1} x_{3} + x_{2} x_{3} = 0$$
$$x_{1} x_{2} x_{3} = -4$$
Gráfica
Suma y producto de raíces [src]
suma
                            _____________     /                              _____________\                               _____________     /         _____________                     \                                          
                         3 /         ___      |        ___            ___ 3 /         ___ |                            3 /         ___      |  ___ 3 /         ___            ___       |                             _____________
            1            \/  3 + 2*\/ 2       |      \/ 3           \/ 3 *\/  3 + 2*\/ 2  |               1            \/  3 + 2*\/ 2       |\/ 3 *\/  3 + 2*\/ 2           \/ 3        |              1           3 /         ___ 
1 - ------------------ - ---------------- + I*|------------------ - ----------------------| + 1 - ------------------ - ---------------- + I*|---------------------- - ------------------| + 1 + ---------------- + \/  3 + 2*\/ 2  
         _____________          2             |     _____________             2           |            _____________          2             |          2                   _____________|          _____________                   
      3 /         ___                         |  3 /         ___                          |         3 /         ___                         |                           3 /         ___ |       3 /         ___                    
    2*\/  3 + 2*\/ 2                          \2*\/  3 + 2*\/ 2                           /       2*\/  3 + 2*\/ 2                          \                         2*\/  3 + 2*\/ 2  /       \/  3 + 2*\/ 2                     
$$\left(\frac{1}{\sqrt[3]{2 \sqrt{2} + 3}} + 1 + \sqrt[3]{2 \sqrt{2} + 3}\right) + \left(\left(- \frac{\sqrt[3]{2 \sqrt{2} + 3}}{2} - \frac{1}{2 \sqrt[3]{2 \sqrt{2} + 3}} + 1 + i \left(- \frac{\sqrt{3} \sqrt[3]{2 \sqrt{2} + 3}}{2} + \frac{\sqrt{3}}{2 \sqrt[3]{2 \sqrt{2} + 3}}\right)\right) + \left(- \frac{\sqrt[3]{2 \sqrt{2} + 3}}{2} - \frac{1}{2 \sqrt[3]{2 \sqrt{2} + 3}} + 1 + i \left(- \frac{\sqrt{3}}{2 \sqrt[3]{2 \sqrt{2} + 3}} + \frac{\sqrt{3} \sqrt[3]{2 \sqrt{2} + 3}}{2}\right)\right)\right)$$
=
      /                              _____________\     /         _____________                     \
      |        ___            ___ 3 /         ___ |     |  ___ 3 /         ___            ___       |
      |      \/ 3           \/ 3 *\/  3 + 2*\/ 2  |     |\/ 3 *\/  3 + 2*\/ 2           \/ 3        |
3 + I*|------------------ - ----------------------| + I*|---------------------- - ------------------|
      |     _____________             2           |     |          2                   _____________|
      |  3 /         ___                          |     |                           3 /         ___ |
      \2*\/  3 + 2*\/ 2                           /     \                         2*\/  3 + 2*\/ 2  /
$$3 + i \left(- \frac{\sqrt{3} \sqrt[3]{2 \sqrt{2} + 3}}{2} + \frac{\sqrt{3}}{2 \sqrt[3]{2 \sqrt{2} + 3}}\right) + i \left(- \frac{\sqrt{3}}{2 \sqrt[3]{2 \sqrt{2} + 3}} + \frac{\sqrt{3} \sqrt[3]{2 \sqrt{2} + 3}}{2}\right)$$
producto
/                            _____________     /                              _____________\\ /                            _____________     /         _____________                     \\                                          
|                         3 /         ___      |        ___            ___ 3 /         ___ || |                         3 /         ___      |  ___ 3 /         ___            ___       || /                          _____________\
|            1            \/  3 + 2*\/ 2       |      \/ 3           \/ 3 *\/  3 + 2*\/ 2  || |            1            \/  3 + 2*\/ 2       |\/ 3 *\/  3 + 2*\/ 2           \/ 3        || |           1           3 /         ___ |
|1 - ------------------ - ---------------- + I*|------------------ - ----------------------||*|1 - ------------------ - ---------------- + I*|---------------------- - ------------------||*|1 + ---------------- + \/  3 + 2*\/ 2  |
|         _____________          2             |     _____________             2           || |         _____________          2             |          2                   _____________|| |       _____________                   |
|      3 /         ___                         |  3 /         ___                          || |      3 /         ___                         |                           3 /         ___ || |    3 /         ___                    |
\    2*\/  3 + 2*\/ 2                          \2*\/  3 + 2*\/ 2                           // \    2*\/  3 + 2*\/ 2                          \                         2*\/  3 + 2*\/ 2  // \    \/  3 + 2*\/ 2                     /
$$\left(- \frac{\sqrt[3]{2 \sqrt{2} + 3}}{2} - \frac{1}{2 \sqrt[3]{2 \sqrt{2} + 3}} + 1 + i \left(- \frac{\sqrt{3}}{2 \sqrt[3]{2 \sqrt{2} + 3}} + \frac{\sqrt{3} \sqrt[3]{2 \sqrt{2} + 3}}{2}\right)\right) \left(- \frac{\sqrt[3]{2 \sqrt{2} + 3}}{2} - \frac{1}{2 \sqrt[3]{2 \sqrt{2} + 3}} + 1 + i \left(- \frac{\sqrt{3} \sqrt[3]{2 \sqrt{2} + 3}}{2} + \frac{\sqrt{3}}{2 \sqrt[3]{2 \sqrt{2} + 3}}\right)\right) \left(\frac{1}{\sqrt[3]{2 \sqrt{2} + 3}} + 1 + \sqrt[3]{2 \sqrt{2} + 3}\right)$$
=
4
$$4$$
4
Respuesta rápida [src]
                                 _____________     /                              _____________\
                              3 /         ___      |        ___            ___ 3 /         ___ |
                 1            \/  3 + 2*\/ 2       |      \/ 3           \/ 3 *\/  3 + 2*\/ 2  |
x1 = 1 - ------------------ - ---------------- + I*|------------------ - ----------------------|
              _____________          2             |     _____________             2           |
           3 /         ___                         |  3 /         ___                          |
         2*\/  3 + 2*\/ 2                          \2*\/  3 + 2*\/ 2                           /
$$x_{1} = - \frac{\sqrt[3]{2 \sqrt{2} + 3}}{2} - \frac{1}{2 \sqrt[3]{2 \sqrt{2} + 3}} + 1 + i \left(- \frac{\sqrt{3} \sqrt[3]{2 \sqrt{2} + 3}}{2} + \frac{\sqrt{3}}{2 \sqrt[3]{2 \sqrt{2} + 3}}\right)$$
                                 _____________     /         _____________                     \
                              3 /         ___      |  ___ 3 /         ___            ___       |
                 1            \/  3 + 2*\/ 2       |\/ 3 *\/  3 + 2*\/ 2           \/ 3        |
x2 = 1 - ------------------ - ---------------- + I*|---------------------- - ------------------|
              _____________          2             |          2                   _____________|
           3 /         ___                         |                           3 /         ___ |
         2*\/  3 + 2*\/ 2                          \                         2*\/  3 + 2*\/ 2  /
$$x_{2} = - \frac{\sqrt[3]{2 \sqrt{2} + 3}}{2} - \frac{1}{2 \sqrt[3]{2 \sqrt{2} + 3}} + 1 + i \left(- \frac{\sqrt{3}}{2 \sqrt[3]{2 \sqrt{2} + 3}} + \frac{\sqrt{3} \sqrt[3]{2 \sqrt{2} + 3}}{2}\right)$$
                               _____________
                1           3 /         ___ 
x3 = 1 + ---------------- + \/  3 + 2*\/ 2  
            _____________                   
         3 /         ___                    
         \/  3 + 2*\/ 2                     
$$x_{3} = \frac{1}{\sqrt[3]{2 \sqrt{2} + 3}} + 1 + \sqrt[3]{2 \sqrt{2} + 3}$$
x3 = (2*sqrt(2) + 3)^(-1/3) + 1 + (2*sqrt(2) + 3)^(1/3)
Respuesta numérica [src]
x1 = 3.35530139760812
x2 = -0.17765069880406 - 1.07730381284996*i
x3 = -0.17765069880406 + 1.07730381284996*i
x3 = -0.17765069880406 + 1.07730381284996*i
Gráfico
x^3-3*x^2-4=0 la ecuación