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(x^2-2x-5)2-2(x2-2x-5)=3 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
/ 2          \                         
\x  - 2*x - 5/*2 - 2*(x2 - 2*x - 5) = 3
$$- 2 \left(\left(- 2 x + x_{2}\right) - 5\right) + 2 \left(\left(x^{2} - 2 x\right) - 5\right) = 3$$
Solución detallada
Transportemos el miembro derecho de la ecuación al
miembro izquierdo de la ecuación con el signo negativo.

La ecuación se convierte de
$$- 2 \left(\left(- 2 x + x_{2}\right) - 5\right) + 2 \left(\left(x^{2} - 2 x\right) - 5\right) = 3$$
en
$$\left(- 2 \left(\left(- 2 x + x_{2}\right) - 5\right) + 2 \left(\left(x^{2} - 2 x\right) - 5\right)\right) - 3 = 0$$
Abramos la expresión en la ecuación
$$\left(- 2 \left(\left(- 2 x + x_{2}\right) - 5\right) + 2 \left(\left(x^{2} - 2 x\right) - 5\right)\right) - 3 = 0$$
Obtenemos la ecuación cuadrática
$$2 x^{2} - 2 x_{2} - 3 = 0$$
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
$$a = 2$$
$$b = 0$$
$$c = - 2 x_{2} - 3$$
, entonces
D = b^2 - 4 * a * c = 

(0)^2 - 4 * (2) * (-3 - 2*x2) = 24 + 16*x2

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

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

o
$$x_{1} = \frac{\sqrt{16 x_{2} + 24}}{4}$$
$$x_{2} = - \frac{\sqrt{16 x_{2} + 24}}{4}$$
Teorema de Cardano-Vieta
reescribamos la ecuación
$$- 2 \left(\left(- 2 x + x_{2}\right) - 5\right) + 2 \left(\left(x^{2} - 2 x\right) - 5\right) = 3$$
de
$$a x^{2} + b x + c = 0$$
como ecuación cuadrática reducida
$$x^{2} + \frac{b x}{a} + \frac{c}{a} = 0$$
$$x^{2} - x_{2} - \frac{3}{2} = 0$$
$$p x + q + x^{2} = 0$$
donde
$$p = \frac{b}{a}$$
$$p = 0$$
$$q = \frac{c}{a}$$
$$q = - x_{2} - \frac{3}{2}$$
Fórmulas de Cardano-Vieta
$$x_{1} + x_{2} = - p$$
$$x_{1} x_{2} = q$$
$$x_{1} + x_{2} = 0$$
$$x_{1} x_{2} = - x_{2} - \frac{3}{2}$$
Gráfica
Respuesta rápida [src]
          ______________________________                                           ______________________________                                   
       4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\     4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\
       \/  (6 + 4*re(x2))  + 16*im (x2) *cos|-----------------------------|   I*\/  (6 + 4*re(x2))  + 16*im (x2) *sin|-----------------------------|
                                            \              2              /                                          \              2              /
x1 = - -------------------------------------------------------------------- - ----------------------------------------------------------------------
                                        2                                                                       2                                   
$$x_{1} = - \frac{i \sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2} - \frac{\sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2}$$
        ______________________________                                           ______________________________                                   
     4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\     4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\
     \/  (6 + 4*re(x2))  + 16*im (x2) *cos|-----------------------------|   I*\/  (6 + 4*re(x2))  + 16*im (x2) *sin|-----------------------------|
                                          \              2              /                                          \              2              /
x2 = -------------------------------------------------------------------- + ----------------------------------------------------------------------
                                      2                                                                       2                                   
$$x_{2} = \frac{i \sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2} + \frac{\sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2}$$
x2 = i*((4*re(x2) + 6)^2 + 16*im(x2)^2)^(1/4)*sin(atan2(4*im(x2, 4*re(x2) + 6)/2)/2 + ((4*re(x2) + 6)^2 + 16*im(x2)^2)^(1/4)*cos(atan2(4*im(x2), 4*re(x2) + 6)/2)/2)
Suma y producto de raíces [src]
suma
     ______________________________                                           ______________________________                                         ______________________________                                           ______________________________                                   
  4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\     4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\   4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\     4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\
  \/  (6 + 4*re(x2))  + 16*im (x2) *cos|-----------------------------|   I*\/  (6 + 4*re(x2))  + 16*im (x2) *sin|-----------------------------|   \/  (6 + 4*re(x2))  + 16*im (x2) *cos|-----------------------------|   I*\/  (6 + 4*re(x2))  + 16*im (x2) *sin|-----------------------------|
                                       \              2              /                                          \              2              /                                        \              2              /                                          \              2              /
- -------------------------------------------------------------------- - ---------------------------------------------------------------------- + -------------------------------------------------------------------- + ----------------------------------------------------------------------
                                   2                                                                       2                                                                       2                                                                       2                                   
$$\left(- \frac{i \sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2} - \frac{\sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2}\right) + \left(\frac{i \sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2} + \frac{\sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2}\right)$$
=
0
$$0$$
producto
/     ______________________________                                           ______________________________                                   \ /   ______________________________                                           ______________________________                                   \
|  4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\     4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\| |4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\     4 /               2        2         /atan2(4*im(x2), 6 + 4*re(x2))\|
|  \/  (6 + 4*re(x2))  + 16*im (x2) *cos|-----------------------------|   I*\/  (6 + 4*re(x2))  + 16*im (x2) *sin|-----------------------------|| |\/  (6 + 4*re(x2))  + 16*im (x2) *cos|-----------------------------|   I*\/  (6 + 4*re(x2))  + 16*im (x2) *sin|-----------------------------||
|                                       \              2              /                                          \              2              /| |                                     \              2              /                                          \              2              /|
|- -------------------------------------------------------------------- - ----------------------------------------------------------------------|*|-------------------------------------------------------------------- + ----------------------------------------------------------------------|
\                                   2                                                                       2                                   / \                                 2                                                                       2                                   /
$$\left(- \frac{i \sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2} - \frac{\sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2}\right) \left(\frac{i \sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2} + \frac{\sqrt[4]{\left(4 \operatorname{re}{\left(x_{2}\right)} + 6\right)^{2} + 16 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}{2} \right)}}{2}\right)$$
=
    _____________________________                                  
   /               2       2       I*atan2(4*im(x2), 6 + 4*re(x2)) 
-\/  (3 + 2*re(x2))  + 4*im (x2) *e                                
-------------------------------------------------------------------
                                 2                                 
$$- \frac{\sqrt{\left(2 \operatorname{re}{\left(x_{2}\right)} + 3\right)^{2} + 4 \left(\operatorname{im}{\left(x_{2}\right)}\right)^{2}} e^{i \operatorname{atan_{2}}{\left(4 \operatorname{im}{\left(x_{2}\right)},4 \operatorname{re}{\left(x_{2}\right)} + 6 \right)}}}{2}$$
-sqrt((3 + 2*re(x2))^2 + 4*im(x2)^2)*exp(i*atan2(4*im(x2), 6 + 4*re(x2)))/2