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4*(((1/sqrt(2))*x-(1/sqrt(2))*y)-2*sqrt(2))^2-2*(((1/sqrt(2))*x+(1/sqrt(2))*y)-sqrt(2))=0 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
                           2                                
  /  x       y         ___\      /  x       y       ___\    
4*|----- - ----- - 2*\/ 2 |  - 2*|----- + ----- - \/ 2 | = 0
  |  ___     ___          |      |  ___     ___        |    
  \\/ 2    \/ 2           /      \\/ 2    \/ 2         /    
$$4 \left(\left(\frac{x}{\sqrt{2}} - \frac{y}{\sqrt{2}}\right) - 2 \sqrt{2}\right)^{2} - 2 \left(\left(\frac{x}{\sqrt{2}} + \frac{y}{\sqrt{2}}\right) - \sqrt{2}\right) = 0$$
Solución detallada
Abramos la expresión en la ecuación
$$4 \left(\left(\frac{x}{\sqrt{2}} - \frac{y}{\sqrt{2}}\right) - 2 \sqrt{2}\right)^{2} - 2 \left(\left(\frac{x}{\sqrt{2}} + \frac{y}{\sqrt{2}}\right) - \sqrt{2}\right) = 0$$
Obtenemos la ecuación cuadrática
$$2 x^{2} - 4 x y - 16 \frac{\sqrt{2}}{2} \sqrt{2} x - \sqrt{2} x + 2 y^{2} - \sqrt{2} y + 16 \frac{\sqrt{2}}{2} \sqrt{2} y + 2 \sqrt{2} + 32 = 0$$
Es la ecuación de la forma
a*x^2 + b*x + c = 0

La ecuación cuadrática puede ser resuelta
con la ayuda del discriminante.
Las raíces de la ecuación cuadrática:
$$x_{1} = \frac{\sqrt{D} - b}{2 a}$$
$$x_{2} = \frac{- \sqrt{D} - b}{2 a}$$
donde D = b^2 - 4*a*c es el discriminante.
Como
$$a = 2$$
$$b = - 4 y - 16 - \sqrt{2}$$
$$c = 2 y^{2} - \sqrt{2} y + 16 y + 2 \sqrt{2} + 32$$
, entonces
D = b^2 - 4 * a * c = 

(-16 - sqrt(2) - 4*y)^2 - 4 * (2) * (32 + 2*sqrt(2) + 2*y^2 + 16*y - y*sqrt(2)) = -256 + (-16 - sqrt(2) - 4*y)^2 - 128*y - 16*sqrt(2) - 16*y^2 + 8*y*sqrt(2)

La ecuación tiene dos raíces.
x1 = (-b + sqrt(D)) / (2*a)

x2 = (-b - sqrt(D)) / (2*a)

o
$$x_{1} = y + \frac{\sqrt{- 16 y^{2} - 128 y + 8 \sqrt{2} y + \left(- 4 y - 16 - \sqrt{2}\right)^{2} - 256 - 16 \sqrt{2}}}{4} + \frac{\sqrt{2}}{4} + 4$$
$$x_{2} = y - \frac{\sqrt{- 16 y^{2} - 128 y + 8 \sqrt{2} y + \left(- 4 y - 16 - \sqrt{2}\right)^{2} - 256 - 16 \sqrt{2}}}{4} + \frac{\sqrt{2}}{4} + 4$$
Gráfica
Respuesta rápida [src]
                   /      _______________________________________________                                                                  \       _______________________________________________                                                                  
                   |     /                                2                  /     /     ___                 ___        ___      \\        |      /                                2                  /     /     ___                 ___        ___      \\        
                   |  4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        |   4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        
           ___     |  \/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *sin|----------------------------------------------------|        |   \/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *cos|----------------------------------------------------|        
         \/ 2      |                                                         \                         2                          /        |                                                          \                         2                          /        
x1 = 4 + ----- + I*|- ------------------------------------------------------------------------------------------------------------- + im(y)| - ------------------------------------------------------------------------------------------------------------- + re(y)
           4       \                                                        4                                                              /                                                         4                                                              
$$x_{1} = i \left(- \frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{im}{\left(y\right)}\right) - \frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{re}{\left(y\right)} + \frac{\sqrt{2}}{4} + 4$$
                   /    _______________________________________________                                                                  \       _______________________________________________                                                                  
                   |   /                                2                  /     /     ___                 ___        ___      \\        |      /                                2                  /     /     ___                 ___        ___      \\        
                   |4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        |   4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        
           ___     |\/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *sin|----------------------------------------------------|        |   \/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *cos|----------------------------------------------------|        
         \/ 2      |                                                       \                         2                          /        |                                                          \                         2                          /        
x2 = 4 + ----- + I*|------------------------------------------------------------------------------------------------------------- + im(y)| + ------------------------------------------------------------------------------------------------------------- + re(y)
           4       \                                                      4                                                              /                                                         4                                                              
$$x_{2} = i \left(\frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{im}{\left(y\right)}\right) + \frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{re}{\left(y\right)} + \frac{\sqrt{2}}{4} + 4$$
x2 = i*(((16*sqrt(2)*re(y) + 2 + 16*sqrt(2))^2 + 512*im(y)^2)^(1/4)*sin(atan2(16*sqrt(2)*im(y, 16*sqrt(2)*re(y) + 2 + 16*sqrt(2))/2)/4 + im(y)) + ((16*sqrt(2)*re(y) + 2 + 16*sqrt(2))^2 + 512*im(y)^2)^(1/4)*cos(atan2(16*sqrt(2)*im(y), 16*sqrt(2)*re(y) + 2 + 16*sqrt(2))/2)/4 + re(y) + sqrt(2)/4 + 4)
Suma y producto de raíces [src]
suma
              /      _______________________________________________                                                                  \       _______________________________________________                                                                                   /    _______________________________________________                                                                  \       _______________________________________________                                                                  
              |     /                                2                  /     /     ___                 ___        ___      \\        |      /                                2                  /     /     ___                 ___        ___      \\                         |   /                                2                  /     /     ___                 ___        ___      \\        |      /                                2                  /     /     ___                 ___        ___      \\        
              |  4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        |   4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|                         |4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        |   4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        
      ___     |  \/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *sin|----------------------------------------------------|        |   \/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *cos|----------------------------------------------------|                 ___     |\/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *sin|----------------------------------------------------|        |   \/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *cos|----------------------------------------------------|        
    \/ 2      |                                                         \                         2                          /        |                                                          \                         2                          /               \/ 2      |                                                       \                         2                          /        |                                                          \                         2                          /        
4 + ----- + I*|- ------------------------------------------------------------------------------------------------------------- + im(y)| - ------------------------------------------------------------------------------------------------------------- + re(y) + 4 + ----- + I*|------------------------------------------------------------------------------------------------------------- + im(y)| + ------------------------------------------------------------------------------------------------------------- + re(y)
      4       \                                                        4                                                              /                                                         4                                                                       4       \                                                      4                                                              /                                                         4                                                              
$$\left(i \left(- \frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{im}{\left(y\right)}\right) - \frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{re}{\left(y\right)} + \frac{\sqrt{2}}{4} + 4\right) + \left(i \left(\frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{im}{\left(y\right)}\right) + \frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{re}{\left(y\right)} + \frac{\sqrt{2}}{4} + 4\right)$$
=
                        /      _______________________________________________                                                                  \     /    _______________________________________________                                                                  \
                        |     /                                2                  /     /     ___                 ___        ___      \\        |     |   /                                2                  /     /     ___                 ___        ___      \\        |
                        |  4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        |     |4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        |
      ___               |  \/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *sin|----------------------------------------------------|        |     |\/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *sin|----------------------------------------------------|        |
    \/ 2                |                                                         \                         2                          /        |     |                                                       \                         2                          /        |
8 + ----- + 2*re(y) + I*|- ------------------------------------------------------------------------------------------------------------- + im(y)| + I*|------------------------------------------------------------------------------------------------------------- + im(y)|
      2                 \                                                        4                                                              /     \                                                      4                                                              /
$$i \left(- \frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{im}{\left(y\right)}\right) + i \left(\frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{im}{\left(y\right)}\right) + 2 \operatorname{re}{\left(y\right)} + \frac{\sqrt{2}}{2} + 8$$
producto
/              /      _______________________________________________                                                                  \       _______________________________________________                                                                  \ /              /    _______________________________________________                                                                  \       _______________________________________________                                                                  \
|              |     /                                2                  /     /     ___                 ___        ___      \\        |      /                                2                  /     /     ___                 ___        ___      \\        | |              |   /                                2                  /     /     ___                 ___        ___      \\        |      /                                2                  /     /     ___                 ___        ___      \\        |
|              |  4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        |   4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        | |              |4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        |   4 /  /         ___        ___      \          2        |atan2\16*\/ 2 *im(y), 2 + 16*\/ 2  + 16*\/ 2 *re(y)/|        |
|      ___     |  \/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *sin|----------------------------------------------------|        |   \/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *cos|----------------------------------------------------|        | |      ___     |\/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *sin|----------------------------------------------------|        |   \/   \2 + 16*\/ 2  + 16*\/ 2 *re(y)/  + 512*im (y) *cos|----------------------------------------------------|        |
|    \/ 2      |                                                         \                         2                          /        |                                                          \                         2                          /        | |    \/ 2      |                                                       \                         2                          /        |                                                          \                         2                          /        |
|4 + ----- + I*|- ------------------------------------------------------------------------------------------------------------- + im(y)| - ------------------------------------------------------------------------------------------------------------- + re(y)|*|4 + ----- + I*|------------------------------------------------------------------------------------------------------------- + im(y)| + ------------------------------------------------------------------------------------------------------------- + re(y)|
\      4       \                                                        4                                                              /                                                         4                                                              / \      4       \                                                      4                                                              /                                                         4                                                              /
$$\left(i \left(- \frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{im}{\left(y\right)}\right) - \frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{re}{\left(y\right)} + \frac{\sqrt{2}}{4} + 4\right) \left(i \left(\frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{im}{\left(y\right)}\right) + \frac{\sqrt[4]{\left(16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2}\right)^{2} + 512 \left(\operatorname{im}{\left(y\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(16 \sqrt{2} \operatorname{im}{\left(y\right)},16 \sqrt{2} \operatorname{re}{\left(y\right)} + 2 + 16 \sqrt{2} \right)}}{2} \right)}}{4} + \operatorname{re}{\left(y\right)} + \frac{\sqrt{2}}{4} + 4\right)$$
=
                                                       ___                               ___      
       ___     2        2                            \/ 2 *re(y)                     I*\/ 2 *im(y)
16 + \/ 2  + re (y) - im (y) + 8*re(y) + 8*I*im(y) - ----------- + 2*I*im(y)*re(y) - -------------
                                                          2                                2      
$$\left(\operatorname{re}{\left(y\right)}\right)^{2} + 2 i \operatorname{re}{\left(y\right)} \operatorname{im}{\left(y\right)} - \frac{\sqrt{2} \operatorname{re}{\left(y\right)}}{2} + 8 \operatorname{re}{\left(y\right)} - \left(\operatorname{im}{\left(y\right)}\right)^{2} - \frac{\sqrt{2} i \operatorname{im}{\left(y\right)}}{2} + 8 i \operatorname{im}{\left(y\right)} + \sqrt{2} + 16$$
16 + sqrt(2) + re(y)^2 - im(y)^2 + 8*re(y) + 8*i*im(y) - sqrt(2)*re(y)/2 + 2*i*im(y)*re(y) - i*sqrt(2)*im(y)/2