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2*x^2-4*x+5*x0=1 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
   2                 
2*x  - 4*x + 5*x0 = 1
$$5 x_{0} + \left(2 x^{2} - 4 x\right) = 1$$
Solución detallada
Transportemos el miembro derecho de la ecuación al
miembro izquierdo de la ecuación con el signo negativo.

La ecuación se convierte de
$$5 x_{0} + \left(2 x^{2} - 4 x\right) = 1$$
en
$$\left(5 x_{0} + \left(2 x^{2} - 4 x\right)\right) - 1 = 0$$
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
$$a = 2$$
$$b = -4$$
$$c = 5 x_{0} - 1$$
, entonces
D = b^2 - 4 * a * c = 

(-4)^2 - 4 * (2) * (-1 + 5*x0) = 24 - 40*x0

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

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

o
$$x_{1} = \frac{\sqrt{24 - 40 x_{0}}}{4} + 1$$
$$x_{2} = 1 - \frac{\sqrt{24 - 40 x_{0}}}{4}$$
Teorema de Cardano-Vieta
reescribamos la ecuación
$$5 x_{0} + \left(2 x^{2} - 4 x\right) = 1$$
de
$$a x^{2} + b x + c = 0$$
como ecuación cuadrática reducida
$$x^{2} + \frac{b x}{a} + \frac{c}{a} = 0$$
$$x^{2} - 2 x + \frac{5 x_{0}}{2} - \frac{1}{2} = 0$$
$$p x + q + x^{2} = 0$$
donde
$$p = \frac{b}{a}$$
$$p = -2$$
$$q = \frac{c}{a}$$
$$q = \frac{5 x_{0}}{2} - \frac{1}{2}$$
Fórmulas de Cardano-Vieta
$$x_{1} + x_{2} = - p$$
$$x_{1} x_{2} = q$$
$$x_{1} + x_{2} = 2$$
$$x_{1} x_{2} = \frac{5 x_{0}}{2} - \frac{1}{2}$$
Gráfica
Suma y producto de raíces [src]
suma
       ________________________________                                              ________________________________                                                ________________________________                                              ________________________________                                      
    4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\     4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\       4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\     4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\
    \/  (6 - 10*re(x0))  + 100*im (x0) *cos|--------------------------------|   I*\/  (6 - 10*re(x0))  + 100*im (x0) *sin|--------------------------------|       \/  (6 - 10*re(x0))  + 100*im (x0) *cos|--------------------------------|   I*\/  (6 - 10*re(x0))  + 100*im (x0) *sin|--------------------------------|
                                           \               2                /                                            \               2                /                                              \               2                /                                            \               2                /
1 - ------------------------------------------------------------------------- - --------------------------------------------------------------------------- + 1 + ------------------------------------------------------------------------- + ---------------------------------------------------------------------------
                                        2                                                                            2                                                                                2                                                                            2                                     
$$\left(- \frac{i \sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} - \frac{\sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} + 1\right) + \left(\frac{i \sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} + \frac{\sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} + 1\right)$$
=
2
$$2$$
producto
/       ________________________________                                              ________________________________                                      \ /       ________________________________                                              ________________________________                                      \
|    4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\     4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\| |    4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\     4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\|
|    \/  (6 - 10*re(x0))  + 100*im (x0) *cos|--------------------------------|   I*\/  (6 - 10*re(x0))  + 100*im (x0) *sin|--------------------------------|| |    \/  (6 - 10*re(x0))  + 100*im (x0) *cos|--------------------------------|   I*\/  (6 - 10*re(x0))  + 100*im (x0) *sin|--------------------------------||
|                                           \               2                /                                            \               2                /| |                                           \               2                /                                            \               2                /|
|1 - ------------------------------------------------------------------------- - ---------------------------------------------------------------------------|*|1 + ------------------------------------------------------------------------- + ---------------------------------------------------------------------------|
\                                        2                                                                            2                                     / \                                        2                                                                            2                                     /
$$\left(- \frac{i \sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} - \frac{\sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} + 1\right) \left(\frac{i \sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} + \frac{\sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} + 1\right)$$
=
  1   5*re(x0)   5*I*im(x0)
- - + -------- + ----------
  2      2           2     
$$\frac{5 \operatorname{re}{\left(x_{0}\right)}}{2} + \frac{5 i \operatorname{im}{\left(x_{0}\right)}}{2} - \frac{1}{2}$$
-1/2 + 5*re(x0)/2 + 5*i*im(x0)/2
Respuesta rápida [src]
            ________________________________                                              ________________________________                                      
         4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\     4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\
         \/  (6 - 10*re(x0))  + 100*im (x0) *cos|--------------------------------|   I*\/  (6 - 10*re(x0))  + 100*im (x0) *sin|--------------------------------|
                                                \               2                /                                            \               2                /
x1 = 1 - ------------------------------------------------------------------------- - ---------------------------------------------------------------------------
                                             2                                                                            2                                     
$$x_{1} = - \frac{i \sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} - \frac{\sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} + 1$$
            ________________________________                                              ________________________________                                      
         4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\     4 /                2         2         /atan2(-10*im(x0), 6 - 10*re(x0))\
         \/  (6 - 10*re(x0))  + 100*im (x0) *cos|--------------------------------|   I*\/  (6 - 10*re(x0))  + 100*im (x0) *sin|--------------------------------|
                                                \               2                /                                            \               2                /
x2 = 1 + ------------------------------------------------------------------------- + ---------------------------------------------------------------------------
                                             2                                                                            2                                     
$$x_{2} = \frac{i \sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \sin{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} + \frac{\sqrt[4]{\left(6 - 10 \operatorname{re}{\left(x_{0}\right)}\right)^{2} + 100 \left(\operatorname{im}{\left(x_{0}\right)}\right)^{2}} \cos{\left(\frac{\operatorname{atan_{2}}{\left(- 10 \operatorname{im}{\left(x_{0}\right)},6 - 10 \operatorname{re}{\left(x_{0}\right)} \right)}}{2} \right)}}{2} + 1$$
x2 = i*((6 - 10*re(x0))^2 + 100*im(x0)^2)^(1/4)*sin(atan2(-10*im(x0, 6 - 10*re(x0))/2)/2 + ((6 - 10*re(x0))^2 + 100*im(x0)^2)^(1/4)*cos(atan2(-10*im(x0), 6 - 10*re(x0))/2)/2 + 1)