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8^(2*x+1)=1/8 la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
 2*x + 1      
8        = 1/8
$$8^{2 x + 1} = \frac{1}{8}$$
Solución detallada
Tenemos la ecuación:
$$8^{2 x + 1} = \frac{1}{8}$$
o
$$8^{2 x + 1} - \frac{1}{8} = 0$$
o
$$8 \cdot 64^{x} = \frac{1}{8}$$
o
$$64^{x} = \frac{1}{64}$$
- es la ecuación exponencial más simple
Sustituimos
$$v = 64^{x}$$
obtendremos
$$v - \frac{1}{64} = 0$$
o
$$v - \frac{1}{64} = 0$$
Transportamos los términos libres (sin v)
del miembro izquierdo al derecho, obtenemos:
$$v = \frac{1}{64}$$
Obtenemos la respuesta: v = 1/64
hacemos cambio inverso
$$64^{x} = v$$
o
$$x = \frac{\log{\left(v \right)}}{\log{\left(64 \right)}}$$
Entonces la respuesta definitiva es
$$x_{1} = \frac{\log{\left(\frac{1}{64} \right)}}{\log{\left(64 \right)}} = -1$$
Gráfica
Respuesta rápida [src]
x1 = -1
$$x_{1} = -1$$
        log(8)      pi*I  
x2 = - -------- + --------
       3*log(2)   3*log(2)
$$x_{2} = - \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} + \frac{i \pi}{3 \log{\left(2 \right)}}$$
        log(8)     2*pi*I 
x3 = - -------- + --------
       3*log(2)   3*log(2)
$$x_{3} = - \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} + \frac{2 i \pi}{3 \log{\left(2 \right)}}$$
        log(8)      pi*I  
x4 = - -------- - --------
       3*log(2)   3*log(2)
$$x_{4} = - \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} - \frac{i \pi}{3 \log{\left(2 \right)}}$$
        log(8)     2*pi*I 
x5 = - -------- - --------
       3*log(2)   3*log(2)
$$x_{5} = - \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} - \frac{2 i \pi}{3 \log{\left(2 \right)}}$$
           pi*I 
x6 = -1 + ------
          log(2)
$$x_{6} = -1 + \frac{i \pi}{\log{\left(2 \right)}}$$
x6 = -1 + i*pi/log(2)
Suma y producto de raíces [src]
suma
        log(8)      pi*I        log(8)     2*pi*I       log(8)      pi*I        log(8)     2*pi*I          pi*I 
-1 + - -------- + -------- + - -------- + -------- + - -------- - -------- + - -------- - -------- + -1 + ------
       3*log(2)   3*log(2)     3*log(2)   3*log(2)     3*log(2)   3*log(2)     3*log(2)   3*log(2)        log(2)
$$\left(\left(- \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} - \frac{2 i \pi}{3 \log{\left(2 \right)}}\right) + \left(\left(- \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} - \frac{i \pi}{3 \log{\left(2 \right)}}\right) + \left(\left(-1 + \left(- \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} + \frac{i \pi}{3 \log{\left(2 \right)}}\right)\right) + \left(- \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} + \frac{2 i \pi}{3 \log{\left(2 \right)}}\right)\right)\right)\right) + \left(-1 + \frac{i \pi}{\log{\left(2 \right)}}\right)$$
=
     4*log(8)    pi*I 
-2 - -------- + ------
     3*log(2)   log(2)
$$- \frac{4 \log{\left(8 \right)}}{3 \log{\left(2 \right)}} - 2 + \frac{i \pi}{\log{\left(2 \right)}}$$
producto
 /   log(8)      pi*I  \ /   log(8)     2*pi*I \ /   log(8)      pi*I  \ /   log(8)     2*pi*I \ /      pi*I \
-|- -------- + --------|*|- -------- + --------|*|- -------- - --------|*|- -------- - --------|*|-1 + ------|
 \  3*log(2)   3*log(2)/ \  3*log(2)   3*log(2)/ \  3*log(2)   3*log(2)/ \  3*log(2)   3*log(2)/ \     log(2)/
$$- (- \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} + \frac{i \pi}{3 \log{\left(2 \right)}}) \left(- \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} + \frac{2 i \pi}{3 \log{\left(2 \right)}}\right) \left(- \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} - \frac{i \pi}{3 \log{\left(2 \right)}}\right) \left(- \frac{\log{\left(8 \right)}}{3 \log{\left(2 \right)}} - \frac{2 i \pi}{3 \log{\left(2 \right)}}\right) \left(-1 + \frac{i \pi}{\log{\left(2 \right)}}\right)$$
=
(pi*I + log(8))*(-pi*I + log(2))*(-pi*I + log(8))*(-2*pi*I + log(8))*(2*pi*I + log(8))
--------------------------------------------------------------------------------------
                                            5                                         
                                      81*log (2)                                      
$$\frac{\left(\log{\left(2 \right)} - i \pi\right) \left(\log{\left(8 \right)} - 2 i \pi\right) \left(\log{\left(8 \right)} - i \pi\right) \left(\log{\left(8 \right)} + i \pi\right) \left(\log{\left(8 \right)} + 2 i \pi\right)}{81 \log{\left(2 \right)}^{5}}$$
(pi*i + log(8))*(-pi*i + log(2))*(-pi*i + log(8))*(-2*pi*i + log(8))*(2*pi*i + log(8))/(81*log(2)^5)
Respuesta numérica [src]
x1 = -1.0
x2 = -1.0 + 1.5107867139424*i
x3 = -1.0 + 3.0215734278848*i
x4 = -1.0 - 1.5107867139424*i
x5 = -1.0 - 3.0215734278848*i
x6 = -1.0 + 4.53236014182719*i
x6 = -1.0 + 4.53236014182719*i