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2^x=8+x la ecuación

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Solución numérica:

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Solución

Ha introducido [src]
 x        
2  = 8 + x
$$2^{x} = x + 8$$
Gráfica
Respuesta rápida [src]
           /-log(2) \
          W|--------|
           \  256   /
x1 = -8 - -----------
             log(2)  
$$x_{1} = -8 - \frac{W\left(- \frac{\log{\left(2 \right)}}{256}\right)}{\log{\left(2 \right)}}$$
           /-log(2)     \
          W|--------, -1|
           \  256       /
x2 = -8 - ---------------
               log(2)    
$$x_{2} = -8 - \frac{W_{-1}\left(- \frac{\log{\left(2 \right)}}{256}\right)}{\log{\left(2 \right)}}$$
x2 = -8 - LambertW(-log(2/256, -1)/log(2))
Suma y producto de raíces [src]
suma
      /-log(2) \         /-log(2)     \
     W|--------|        W|--------, -1|
      \  256   /         \  256       /
-8 - ----------- + -8 - ---------------
        log(2)               log(2)    
$$\left(-8 - \frac{W\left(- \frac{\log{\left(2 \right)}}{256}\right)}{\log{\left(2 \right)}}\right) + \left(-8 - \frac{W_{-1}\left(- \frac{\log{\left(2 \right)}}{256}\right)}{\log{\left(2 \right)}}\right)$$
=
       /-log(2) \    /-log(2)     \
      W|--------|   W|--------, -1|
       \  256   /    \  256       /
-16 - ----------- - ---------------
         log(2)          log(2)    
$$-16 - \frac{W\left(- \frac{\log{\left(2 \right)}}{256}\right)}{\log{\left(2 \right)}} - \frac{W_{-1}\left(- \frac{\log{\left(2 \right)}}{256}\right)}{\log{\left(2 \right)}}$$
producto
/      /-log(2) \\ /      /-log(2)     \\
|     W|--------|| |     W|--------, -1||
|      \  256   /| |      \  256       /|
|-8 - -----------|*|-8 - ---------------|
\        log(2)  / \          log(2)    /
$$\left(-8 - \frac{W\left(- \frac{\log{\left(2 \right)}}{256}\right)}{\log{\left(2 \right)}}\right) \left(-8 - \frac{W_{-1}\left(- \frac{\log{\left(2 \right)}}{256}\right)}{\log{\left(2 \right)}}\right)$$
=
/            /-log(2) \\ /            /-log(2)     \\
|8*log(2) + W|--------||*|8*log(2) + W|--------, -1||
\            \  256   // \            \  256       //
-----------------------------------------------------
                          2                          
                       log (2)                       
$$\frac{\left(W\left(- \frac{\log{\left(2 \right)}}{256}\right) + 8 \log{\left(2 \right)}\right) \left(W_{-1}\left(- \frac{\log{\left(2 \right)}}{256}\right) + 8 \log{\left(2 \right)}\right)}{\log{\left(2 \right)}^{2}}$$
(8*log(2) + LambertW(-log(2)/256))*(8*log(2) + LambertW(-log(2)/256, -1))/log(2)^2
Respuesta numérica [src]
x1 = -7.99608313024967
x2 = 3.5269373407231
x2 = 3.5269373407231