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(0,2)^x-2=5^x2 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
 -x        x2
5   - 2 = 5  
$$-2 + \left(\frac{1}{5}\right)^{x} = 5^{x_{2}}$$
Solución detallada
Tenemos la ecuación:
$$-2 + \left(\frac{1}{5}\right)^{x} = 5^{x_{2}}$$
o
$$- 5^{x_{2}} + \left(-2 + \left(\frac{1}{5}\right)^{x}\right) = 0$$
Sustituimos
$$v = \left(\frac{1}{5}\right)^{x}$$
obtendremos
$$- 5^{x_{2}} + v - 2 = 0$$
o
$$- 5^{x_{2}} + v - 2 = 0$$
hacemos cambio inverso
$$\left(\frac{1}{5}\right)^{x} = v$$
o
$$x = - \frac{\log{\left(v \right)}}{\log{\left(5 \right)}}$$
Entonces la respuesta definitiva es
$$x_{1} = \frac{\log{\left(\frac{\log{\left(\frac{1}{5^{x_{2}} + 2} \right)}}{\log{\left(5 \right)}} \right)}}{\log{\left(\frac{1}{5} \right)}} = - \frac{\log{\left(\frac{\log{\left(\frac{1}{5^{x_{2}} + 2} \right)}}{\log{\left(5 \right)}} \right)}}{\log{\left(5 \right)}}$$
Gráfica
Respuesta rápida [src]
        /    1    \        /   1   \
     log|---------|   I*arg|-------|
        ||     x2||        |     x2|
        \|2 + 5  |/        \2 + 5  /
x1 = -------------- + --------------
         log(5)           log(5)    
$$x_{1} = \frac{\log{\left(\frac{1}{\left|{5^{x_{2}} + 2}\right|} \right)}}{\log{\left(5 \right)}} + \frac{i \arg{\left(\frac{1}{5^{x_{2}} + 2} \right)}}{\log{\left(5 \right)}}$$
x1 = log(1/|5^x2 + 2|)/log(5) + i*arg(1/(5^x2 + 2))/log(5)
Suma y producto de raíces [src]
suma
   /    1    \        /   1   \
log|---------|   I*arg|-------|
   ||     x2||        |     x2|
   \|2 + 5  |/        \2 + 5  /
-------------- + --------------
    log(5)           log(5)    
$$\frac{\log{\left(\frac{1}{\left|{5^{x_{2}} + 2}\right|} \right)}}{\log{\left(5 \right)}} + \frac{i \arg{\left(\frac{1}{5^{x_{2}} + 2} \right)}}{\log{\left(5 \right)}}$$
=
   /    1    \        /   1   \
log|---------|   I*arg|-------|
   ||     x2||        |     x2|
   \|2 + 5  |/        \2 + 5  /
-------------- + --------------
    log(5)           log(5)    
$$\frac{\log{\left(\frac{1}{\left|{5^{x_{2}} + 2}\right|} \right)}}{\log{\left(5 \right)}} + \frac{i \arg{\left(\frac{1}{5^{x_{2}} + 2} \right)}}{\log{\left(5 \right)}}$$
producto
   /    1    \        /   1   \
log|---------|   I*arg|-------|
   ||     x2||        |     x2|
   \|2 + 5  |/        \2 + 5  /
-------------- + --------------
    log(5)           log(5)    
$$\frac{\log{\left(\frac{1}{\left|{5^{x_{2}} + 2}\right|} \right)}}{\log{\left(5 \right)}} + \frac{i \arg{\left(\frac{1}{5^{x_{2}} + 2} \right)}}{\log{\left(5 \right)}}$$
=
     /   1   \      /    1    \
I*arg|-------| + log|---------|
     |     x2|      ||     x2||
     \2 + 5  /      \|2 + 5  |/
-------------------------------
             log(5)            
$$\frac{\log{\left(\frac{1}{\left|{5^{x_{2}} + 2}\right|} \right)} + i \arg{\left(\frac{1}{5^{x_{2}} + 2} \right)}}{\log{\left(5 \right)}}$$
(i*arg(1/(2 + 5^x2)) + log(1/|2 + 5^x2|))/log(5)