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xyy=1+y^2 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
             2
x*y*y = 1 + y 
$$y x y = y^{2} + 1$$
Solución detallada
Transportemos el miembro derecho de la ecuación al
miembro izquierdo de la ecuación con el signo negativo.

La ecuación se convierte de
$$y x y = y^{2} + 1$$
en
$$y x y + \left(- y^{2} - 1\right) = 0$$
Es la ecuación de la forma
a*y^2 + b*y + c = 0

La ecuación cuadrática puede ser resuelta
con la ayuda del discriminante.
Las raíces de la ecuación cuadrática:
$$y_{1} = \frac{\sqrt{D} - b}{2 a}$$
$$y_{2} = \frac{- \sqrt{D} - b}{2 a}$$
donde D = b^2 - 4*a*c es el discriminante.
Como
$$a = x - 1$$
$$b = 0$$
$$c = -1$$
, entonces
D = b^2 - 4 * a * c = 

(0)^2 - 4 * (-1 + x) * (-1) = -4 + 4*x

La ecuación tiene dos raíces.
y1 = (-b + sqrt(D)) / (2*a)

y2 = (-b - sqrt(D)) / (2*a)

o
$$y_{1} = \frac{\sqrt{4 x - 4}}{2 x - 2}$$
$$y_{2} = - \frac{\sqrt{4 x - 4}}{2 x - 2}$$
Resolución de la ecuación paramétrica
Se da la ecuación con parámetro:
$$x y^{2} = y^{2} + 1$$
Коэффициент при y равен
$$x - 1$$
entonces son posibles los casos para x :
$$x < 1$$
$$x = 1$$
Consideremos todos los casos con detalles:
Con
$$x < 1$$
la ecuación será
$$- y^{2} - 1 = 0$$
su solución
no hay soluciones
Con
$$x = 1$$
la ecuación será
$$-1 = 0$$
su solución
no hay soluciones
Teorema de Cardano-Vieta
reescribamos la ecuación
$$y x y = y^{2} + 1$$
de
$$a y^{2} + b y + c = 0$$
como ecuación cuadrática reducida
$$y^{2} + \frac{b y}{a} + \frac{c}{a} = 0$$
$$\frac{x y^{2} - y^{2} - 1}{x - 1} = 0$$
$$p y + q + y^{2} = 0$$
donde
$$p = \frac{b}{a}$$
$$p = 0$$
$$q = \frac{c}{a}$$
$$q = - \frac{1}{x - 1}$$
Fórmulas de Cardano-Vieta
$$y_{1} + y_{2} = - p$$
$$y_{1} y_{2} = q$$
$$y_{1} + y_{2} = 0$$
$$y_{1} y_{2} = - \frac{1}{x - 1}$$
Gráfica
Suma y producto de raíces [src]
suma
                                                                    /     /       -im(x)                 -1 + re(x)      \\                                                                       /     /       -im(x)                 -1 + re(x)      \\                                                                     /     /       -im(x)                 -1 + re(x)      \\                                                                       /     /       -im(x)                 -1 + re(x)      \\
         _______________________________________________________    |atan2|----------------------, ----------------------||            _______________________________________________________    |atan2|----------------------, ----------------------||          _______________________________________________________    |atan2|----------------------, ----------------------||            _______________________________________________________    |atan2|----------------------, ----------------------||
        /                   2                     2                 |     |            2     2                 2     2   ||           /                   2                     2                 |     |            2     2                 2     2   ||         /                   2                     2                 |     |            2     2                 2     2   ||           /                   2                     2                 |     |            2     2                 2     2   ||
       /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|          /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|        /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|          /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|
-     /   ------------------------- + ------------------------- *cos|-----------------------------------------------------| - I*    /   ------------------------- + ------------------------- *sin|-----------------------------------------------------| +     /   ------------------------- + ------------------------- *cos|-----------------------------------------------------| + I*    /   ------------------------- + ------------------------- *sin|-----------------------------------------------------|
     /                            2                           2     \                          2                          /        /                            2                           2     \                          2                          /      /                            2                           2     \                          2                          /        /                            2                           2     \                          2                          /
  4 /     /            2     2   \    /            2     2   \                                                                  4 /     /            2     2   \    /            2     2   \                                                                4 /     /            2     2   \    /            2     2   \                                                                  4 /     /            2     2   \    /            2     2   \                                                             
  \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                                  \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                                \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                                  \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                             
$$\left(- i \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)} - \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)}\right) + \left(i \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)} + \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)}\right)$$
=
0
$$0$$
producto
/                                                                    /     /       -im(x)                 -1 + re(x)      \\                                                                       /     /       -im(x)                 -1 + re(x)      \\\ /                                                                  /     /       -im(x)                 -1 + re(x)      \\                                                                       /     /       -im(x)                 -1 + re(x)      \\\
|         _______________________________________________________    |atan2|----------------------, ----------------------||            _______________________________________________________    |atan2|----------------------, ----------------------||| |       _______________________________________________________    |atan2|----------------------, ----------------------||            _______________________________________________________    |atan2|----------------------, ----------------------|||
|        /                   2                     2                 |     |            2     2                 2     2   ||           /                   2                     2                 |     |            2     2                 2     2   ||| |      /                   2                     2                 |     |            2     2                 2     2   ||           /                   2                     2                 |     |            2     2                 2     2   |||
|       /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|          /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|| |     /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|          /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/||
|-     /   ------------------------- + ------------------------- *cos|-----------------------------------------------------| - I*    /   ------------------------- + ------------------------- *sin|-----------------------------------------------------||*|    /   ------------------------- + ------------------------- *cos|-----------------------------------------------------| + I*    /   ------------------------- + ------------------------- *sin|-----------------------------------------------------||
|     /                            2                           2     \                          2                          /        /                            2                           2     \                          2                          /| |   /                            2                           2     \                          2                          /        /                            2                           2     \                          2                          /|
|  4 /     /            2     2   \    /            2     2   \                                                                  4 /     /            2     2   \    /            2     2   \                                                             | |4 /     /            2     2   \    /            2     2   \                                                                  4 /     /            2     2   \    /            2     2   \                                                             |
\  \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                                  \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                             / \\/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                                  \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                             /
$$\left(- i \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)} - \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)}\right) \left(i \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)} + \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)}\right)$$
=
         /       -im(x)                 -1 + re(x)      \ 
  I*atan2|----------------------, ----------------------| 
         |            2     2                 2     2   | 
         \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/ 
-e                                                        
----------------------------------------------------------
                  ________________________                
                 /             2     2                    
               \/  (-1 + re(x))  + im (x)                 
$$- \frac{e^{i \operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}}{\sqrt{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}}}$$
-exp(i*atan2(-im(x)/((-1 + re(x))^2 + im(x)^2), (-1 + re(x))/((-1 + re(x))^2 + im(x)^2)))/sqrt((-1 + re(x))^2 + im(x)^2)
Respuesta rápida [src]
                                                                         /     /       -im(x)                 -1 + re(x)      \\                                                                       /     /       -im(x)                 -1 + re(x)      \\
              _______________________________________________________    |atan2|----------------------, ----------------------||            _______________________________________________________    |atan2|----------------------, ----------------------||
             /                   2                     2                 |     |            2     2                 2     2   ||           /                   2                     2                 |     |            2     2                 2     2   ||
            /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|          /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|
y1 = -     /   ------------------------- + ------------------------- *cos|-----------------------------------------------------| - I*    /   ------------------------- + ------------------------- *sin|-----------------------------------------------------|
          /                            2                           2     \                          2                          /        /                            2                           2     \                          2                          /
       4 /     /            2     2   \    /            2     2   \                                                                  4 /     /            2     2   \    /            2     2   \                                                             
       \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                                  \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                             
$$y_{1} = - i \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)} - \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)}$$
                                                                       /     /       -im(x)                 -1 + re(x)      \\                                                                       /     /       -im(x)                 -1 + re(x)      \\
            _______________________________________________________    |atan2|----------------------, ----------------------||            _______________________________________________________    |atan2|----------------------, ----------------------||
           /                   2                     2                 |     |            2     2                 2     2   ||           /                   2                     2                 |     |            2     2                 2     2   ||
          /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|          /        (-1 + re(x))                    im (x)              |     \(-1 + re(x))  + im (x)  (-1 + re(x))  + im (x)/|
y2 =     /   ------------------------- + ------------------------- *cos|-----------------------------------------------------| + I*    /   ------------------------- + ------------------------- *sin|-----------------------------------------------------|
        /                            2                           2     \                          2                          /        /                            2                           2     \                          2                          /
     4 /     /            2     2   \    /            2     2   \                                                                  4 /     /            2     2   \    /            2     2   \                                                             
     \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                                  \/      \(-1 + re(x))  + im (x)/    \(-1 + re(x))  + im (x)/                                                             
$$y_{2} = i \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)} + \sqrt[4]{\frac{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}} + \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{\left(\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}\right)^{2}}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- \frac{\operatorname{im}{\left(x\right)}}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}},\frac{\operatorname{re}{\left(x\right)} - 1}{\left(\operatorname{re}{\left(x\right)} - 1\right)^{2} + \left(\operatorname{im}{\left(x\right)}\right)^{2}} \right)}}{2} \right)}$$
y2 = i*((re(x) - 1)^2/((re(x) - 1)^2 + im(x)^2)^2 + im(x)^2/((re(x) - 1)^2 + im(x)^2)^2)^(1/4)*sin(atan2(-im(x)/((re(x) - 1)^2 + im(x)^2, (re(x) - 1)/((re(x) - 1)^2 + im(x)^2))/2) + ((re(x) - 1)^2/((re(x) - 1)^2 + im(x)^2)^2 + im(x)^2/((re(x) - 1)^2 + im(x)^2)^2)^(1/4)*cos(atan2(-im(x)/((re(x) - 1)^2 + im(x)^2), (re(x) - 1)/((re(x) - 1)^2 + im(x)^2))/2))