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ln(u-1)=1/2*((x^2-4*x)/2) la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
             / 2      \
             |x  - 4*x|
             |--------|
             \   2    /
log(u - 1) = ----------
                 2     
$$\log{\left(u - 1 \right)} = \frac{\frac{1}{2} \left(x^{2} - 4 x\right)}{2}$$
Solución detallada
Tenemos la ecuación
$$\log{\left(u - 1 \right)} = \frac{\frac{1}{2} \left(x^{2} - 4 x\right)}{2}$$
$$\log{\left(u - 1 \right)} = \frac{x^{2}}{4} - x$$
Es la ecuación de la forma:
log(v)=p

Por definición log
v=e^p

entonces
$$u - 1 = e^{\frac{\frac{x^{2}}{4} - x}{1}}$$
simplificamos
$$u - 1 = e^{\frac{x^{2}}{4} - x}$$
$$u = e^{\frac{x^{2}}{4} - x} + 1$$
Gráfica
Respuesta rápida [src]
                                               2        2                    2        2                             
                                             im (x)   re (x)               im (x)   re (x)                          
                                    -re(x) - ------ + ------      -re(x) - ------ + ------                          
            /         im(x)*re(x)\             4        4                    4        4       /         im(x)*re(x)\
u1 = 1 + cos|-im(x) + -----------|*e                         + I*e                        *sin|-im(x) + -----------|
            \              2     /                                                            \              2     /
$$u_{1} = i e^{\frac{\left(\operatorname{re}{\left(x\right)}\right)^{2}}{4} - \operatorname{re}{\left(x\right)} - \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{4}} \sin{\left(\frac{\operatorname{re}{\left(x\right)} \operatorname{im}{\left(x\right)}}{2} - \operatorname{im}{\left(x\right)} \right)} + e^{\frac{\left(\operatorname{re}{\left(x\right)}\right)^{2}}{4} - \operatorname{re}{\left(x\right)} - \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{4}} \cos{\left(\frac{\operatorname{re}{\left(x\right)} \operatorname{im}{\left(x\right)}}{2} - \operatorname{im}{\left(x\right)} \right)} + 1$$
u1 = i*exp(re(x)^2/4 - re(x) - im(x)^2/4)*sin(re(x)*im(x)/2 - im(x)) + exp(re(x)^2/4 - re(x) - im(x)^2/4)*cos(re(x)*im(x)/2 - im(x)) + 1
Suma y producto de raíces [src]
suma
                                          2        2                    2        2                             
                                        im (x)   re (x)               im (x)   re (x)                          
                               -re(x) - ------ + ------      -re(x) - ------ + ------                          
       /         im(x)*re(x)\             4        4                    4        4       /         im(x)*re(x)\
1 + cos|-im(x) + -----------|*e                         + I*e                        *sin|-im(x) + -----------|
       \              2     /                                                            \              2     /
$$i e^{\frac{\left(\operatorname{re}{\left(x\right)}\right)^{2}}{4} - \operatorname{re}{\left(x\right)} - \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{4}} \sin{\left(\frac{\operatorname{re}{\left(x\right)} \operatorname{im}{\left(x\right)}}{2} - \operatorname{im}{\left(x\right)} \right)} + e^{\frac{\left(\operatorname{re}{\left(x\right)}\right)^{2}}{4} - \operatorname{re}{\left(x\right)} - \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{4}} \cos{\left(\frac{\operatorname{re}{\left(x\right)} \operatorname{im}{\left(x\right)}}{2} - \operatorname{im}{\left(x\right)} \right)} + 1$$
=
                                          2        2                    2        2                             
                                        im (x)   re (x)               im (x)   re (x)                          
                               -re(x) - ------ + ------      -re(x) - ------ + ------                          
       /         im(x)*re(x)\             4        4                    4        4       /         im(x)*re(x)\
1 + cos|-im(x) + -----------|*e                         + I*e                        *sin|-im(x) + -----------|
       \              2     /                                                            \              2     /
$$i e^{\frac{\left(\operatorname{re}{\left(x\right)}\right)^{2}}{4} - \operatorname{re}{\left(x\right)} - \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{4}} \sin{\left(\frac{\operatorname{re}{\left(x\right)} \operatorname{im}{\left(x\right)}}{2} - \operatorname{im}{\left(x\right)} \right)} + e^{\frac{\left(\operatorname{re}{\left(x\right)}\right)^{2}}{4} - \operatorname{re}{\left(x\right)} - \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{4}} \cos{\left(\frac{\operatorname{re}{\left(x\right)} \operatorname{im}{\left(x\right)}}{2} - \operatorname{im}{\left(x\right)} \right)} + 1$$
producto
                                          2        2                    2        2                             
                                        im (x)   re (x)               im (x)   re (x)                          
                               -re(x) - ------ + ------      -re(x) - ------ + ------                          
       /         im(x)*re(x)\             4        4                    4        4       /         im(x)*re(x)\
1 + cos|-im(x) + -----------|*e                         + I*e                        *sin|-im(x) + -----------|
       \              2     /                                                            \              2     /
$$i e^{\frac{\left(\operatorname{re}{\left(x\right)}\right)^{2}}{4} - \operatorname{re}{\left(x\right)} - \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{4}} \sin{\left(\frac{\operatorname{re}{\left(x\right)} \operatorname{im}{\left(x\right)}}{2} - \operatorname{im}{\left(x\right)} \right)} + e^{\frac{\left(\operatorname{re}{\left(x\right)}\right)^{2}}{4} - \operatorname{re}{\left(x\right)} - \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{4}} \cos{\left(\frac{\operatorname{re}{\left(x\right)} \operatorname{im}{\left(x\right)}}{2} - \operatorname{im}{\left(x\right)} \right)} + 1$$
=
                                        2        2                    2        2                           
                                      im (x)   re (x)               im (x)   re (x)                        
                             -re(x) - ------ + ------      -re(x) - ------ + ------                        
       /(-2 + re(x))*im(x)\             4        4                    4        4       /(-2 + re(x))*im(x)\
1 + cos|------------------|*e                         + I*e                        *sin|------------------|
       \        2         /                                                            \        2         /
$$i e^{\frac{\left(\operatorname{re}{\left(x\right)}\right)^{2}}{4} - \operatorname{re}{\left(x\right)} - \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{4}} \sin{\left(\frac{\left(\operatorname{re}{\left(x\right)} - 2\right) \operatorname{im}{\left(x\right)}}{2} \right)} + e^{\frac{\left(\operatorname{re}{\left(x\right)}\right)^{2}}{4} - \operatorname{re}{\left(x\right)} - \frac{\left(\operatorname{im}{\left(x\right)}\right)^{2}}{4}} \cos{\left(\frac{\left(\operatorname{re}{\left(x\right)} - 2\right) \operatorname{im}{\left(x\right)}}{2} \right)} + 1$$
1 + cos((-2 + re(x))*im(x)/2)*exp(-re(x) - im(x)^2/4 + re(x)^2/4) + i*exp(-re(x) - im(x)^2/4 + re(x)^2/4)*sin((-2 + re(x))*im(x)/2)