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6x^3+3sqrt(2)*x^2-6*x+2sqrt(2)=0 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
   3       ___  2             ___    
6*x  + 3*\/ 2 *x  - 6*x + 2*\/ 2  = 0
$$\left(- 6 x + \left(6 x^{3} + 3 \sqrt{2} x^{2}\right)\right) + 2 \sqrt{2} = 0$$
Teorema de Cardano-Vieta
reescribamos la ecuación
$$\left(- 6 x + \left(6 x^{3} + 3 \sqrt{2} x^{2}\right)\right) + 2 \sqrt{2} = 0$$
de
$$a x^{3} + b x^{2} + c x + d = 0$$
como ecuación cúbica reducida
$$x^{3} + \frac{b x^{2}}{a} + \frac{c x}{a} + \frac{d}{a} = 0$$
$$x^{3} + \frac{\sqrt{2} x^{2}}{2} - x + \frac{\sqrt{2}}{3} = 0$$
$$p x^{2} + q x + v + x^{3} = 0$$
donde
$$p = \frac{b}{a}$$
$$p = \frac{\sqrt{2}}{2}$$
$$q = \frac{c}{a}$$
$$q = -1$$
$$v = \frac{d}{a}$$
$$v = \frac{\sqrt{2}}{3}$$
Fórmulas de Cardano-Vieta
$$x_{1} + x_{2} + x_{3} = - p$$
$$x_{1} x_{2} + x_{1} x_{3} + x_{2} x_{3} = q$$
$$x_{1} x_{2} x_{3} = v$$
$$x_{1} + x_{2} + x_{3} = - \frac{\sqrt{2}}{2}$$
$$x_{1} x_{2} + x_{1} x_{3} + x_{2} x_{3} = -1$$
$$x_{1} x_{2} x_{3} = \frac{\sqrt{2}}{3}$$
Gráfica
Respuesta rápida [src]
         ___     /    ___ 3 ___     ___  2/3\     ___ 3 ___     ___  2/3
       \/ 2      |  \/ 6 *\/ 7    \/ 6 *7   |   \/ 2 *\/ 7    \/ 2 *7   
x1 = - ----- + I*|- ----------- + ----------| + ----------- + ----------
         6       \       12           12    /        12           12    
$$x_{1} = - \frac{\sqrt{2}}{6} + \frac{\sqrt{2} \sqrt[3]{7}}{12} + \frac{\sqrt{2} \cdot 7^{\frac{2}{3}}}{12} + i \left(- \frac{\sqrt{6} \sqrt[3]{7}}{12} + \frac{\sqrt{6} \cdot 7^{\frac{2}{3}}}{12}\right)$$
         ___     /    ___  2/3     ___ 3 ___\     ___ 3 ___     ___  2/3
       \/ 2      |  \/ 6 *7      \/ 6 *\/ 7 |   \/ 2 *\/ 7    \/ 2 *7   
x2 = - ----- + I*|- ---------- + -----------| + ----------- + ----------
         6       \      12            12    /        12           12    
$$x_{2} = - \frac{\sqrt{2}}{6} + \frac{\sqrt{2} \sqrt[3]{7}}{12} + \frac{\sqrt{2} \cdot 7^{\frac{2}{3}}}{12} + i \left(- \frac{\sqrt{6} \cdot 7^{\frac{2}{3}}}{12} + \frac{\sqrt{6} \sqrt[3]{7}}{12}\right)$$
         ___     ___ 3 ___     ___    2/3
       \/ 2    \/ 2 *\/ 7    \/ 2 *4*7   
x3 = - ----- - ----------- - ------------
         6          6             24     
$$x_{3} = - \frac{\sqrt{2} \cdot 4 \cdot 7^{\frac{2}{3}}}{24} - \frac{\sqrt{2} \sqrt[3]{7}}{6} - \frac{\sqrt{2}}{6}$$
x3 = -sqrt(2)*4*7^(2/3)/24 - sqrt(2)*7^(1/3)/6 - sqrt(2)/6
Suma y producto de raíces [src]
suma
    ___     /    ___ 3 ___     ___  2/3\     ___ 3 ___     ___  2/3       ___     /    ___  2/3     ___ 3 ___\     ___ 3 ___     ___  2/3       ___     ___ 3 ___     ___    2/3
  \/ 2      |  \/ 6 *\/ 7    \/ 6 *7   |   \/ 2 *\/ 7    \/ 2 *7        \/ 2      |  \/ 6 *7      \/ 6 *\/ 7 |   \/ 2 *\/ 7    \/ 2 *7        \/ 2    \/ 2 *\/ 7    \/ 2 *4*7   
- ----- + I*|- ----------- + ----------| + ----------- + ---------- + - ----- + I*|- ---------- + -----------| + ----------- + ---------- + - ----- - ----------- - ------------
    6       \       12           12    /        12           12           6       \      12            12    /        12           12           6          6             24     
$$\left(- \frac{\sqrt{2} \cdot 4 \cdot 7^{\frac{2}{3}}}{24} - \frac{\sqrt{2} \sqrt[3]{7}}{6} - \frac{\sqrt{2}}{6}\right) + \left(\left(- \frac{\sqrt{2}}{6} + \frac{\sqrt{2} \sqrt[3]{7}}{12} + \frac{\sqrt{2} \cdot 7^{\frac{2}{3}}}{12} + i \left(- \frac{\sqrt{6} \cdot 7^{\frac{2}{3}}}{12} + \frac{\sqrt{6} \sqrt[3]{7}}{12}\right)\right) + \left(- \frac{\sqrt{2}}{6} + \frac{\sqrt{2} \sqrt[3]{7}}{12} + \frac{\sqrt{2} \cdot 7^{\frac{2}{3}}}{12} + i \left(- \frac{\sqrt{6} \sqrt[3]{7}}{12} + \frac{\sqrt{6} \cdot 7^{\frac{2}{3}}}{12}\right)\right)\right)$$
=
    ___     /    ___ 3 ___     ___  2/3\     /    ___  2/3     ___ 3 ___\
  \/ 2      |  \/ 6 *\/ 7    \/ 6 *7   |     |  \/ 6 *7      \/ 6 *\/ 7 |
- ----- + I*|- ----------- + ----------| + I*|- ---------- + -----------|
    2       \       12           12    /     \      12            12    /
$$- \frac{\sqrt{2}}{2} + i \left(- \frac{\sqrt{6} \cdot 7^{\frac{2}{3}}}{12} + \frac{\sqrt{6} \sqrt[3]{7}}{12}\right) + i \left(- \frac{\sqrt{6} \sqrt[3]{7}}{12} + \frac{\sqrt{6} \cdot 7^{\frac{2}{3}}}{12}\right)$$
producto
/    ___     /    ___ 3 ___     ___  2/3\     ___ 3 ___     ___  2/3\ /    ___     /    ___  2/3     ___ 3 ___\     ___ 3 ___     ___  2/3\ /    ___     ___ 3 ___     ___    2/3\
|  \/ 2      |  \/ 6 *\/ 7    \/ 6 *7   |   \/ 2 *\/ 7    \/ 2 *7   | |  \/ 2      |  \/ 6 *7      \/ 6 *\/ 7 |   \/ 2 *\/ 7    \/ 2 *7   | |  \/ 2    \/ 2 *\/ 7    \/ 2 *4*7   |
|- ----- + I*|- ----------- + ----------| + ----------- + ----------|*|- ----- + I*|- ---------- + -----------| + ----------- + ----------|*|- ----- - ----------- - ------------|
\    6       \       12           12    /        12           12    / \    6       \      12            12    /        12           12    / \    6          6             24     /
$$\left(- \frac{\sqrt{2}}{6} + \frac{\sqrt{2} \sqrt[3]{7}}{12} + \frac{\sqrt{2} \cdot 7^{\frac{2}{3}}}{12} + i \left(- \frac{\sqrt{6} \sqrt[3]{7}}{12} + \frac{\sqrt{6} \cdot 7^{\frac{2}{3}}}{12}\right)\right) \left(- \frac{\sqrt{2}}{6} + \frac{\sqrt{2} \sqrt[3]{7}}{12} + \frac{\sqrt{2} \cdot 7^{\frac{2}{3}}}{12} + i \left(- \frac{\sqrt{6} \cdot 7^{\frac{2}{3}}}{12} + \frac{\sqrt{6} \sqrt[3]{7}}{12}\right)\right) \left(- \frac{\sqrt{2} \cdot 4 \cdot 7^{\frac{2}{3}}}{24} - \frac{\sqrt{2} \sqrt[3]{7}}{6} - \frac{\sqrt{2}}{6}\right)$$
=
   ___ 
-\/ 2  
-------
   3   
$$- \frac{\sqrt{2}}{3}$$
-sqrt(2)/3
Respuesta numérica [src]
x1 = 0.42099215515006 + 0.356477207629844*i
x2 = 0.42099215515006 - 0.356477207629844*i
x3 = -1.54909109148667
x3 = -1.54909109148667