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Suma de la serie ((-1)^(n+1)*(x+7)^(n-1))/(4^(2n-4))



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Solución

Ha introducido [src]
  oo                        
____                        
\   `                       
 \        n + 1        n - 1
  \   (-1)     *(x + 7)     
   )  ----------------------
  /           2*n - 4       
 /           4              
/___,                       
n = 1                       
$$\sum_{n=1}^{\infty} \frac{\left(-1\right)^{n + 1} \left(x + 7\right)^{n - 1}}{4^{2 n - 4}}$$
Sum(((-1)^(n + 1)*(x + 7)^(n - 1))/4^(2*n - 4), (n, 1, oo))
Respuesta [src]
     //          7    x                             \
     ||        - -- - --                            |
     ||          16   16               |7    x |    |
     ||        ---------           for |-- + --| < 1|
     ||         23   x                 |16   16|    |
     ||         -- + --                             |
     ||         16   16                             |
-256*|<                                             |
     ||  oo                                         |
     || ___                                         |
     || \  `                                        |
     ||  \       n  -2*n        n                   |
     ||  /   (-1) *4    *(7 + x)       otherwise    |
     || /__,                                        |
     \\n = 1                                        /
-----------------------------------------------------
                        7 + x                        
$$- \frac{256 \left(\begin{cases} \frac{- \frac{x}{16} - \frac{7}{16}}{\frac{x}{16} + \frac{23}{16}} & \text{for}\: \left|{\frac{x}{16} + \frac{7}{16}}\right| < 1 \\\sum_{n=1}^{\infty} \left(-1\right)^{n} 4^{- 2 n} \left(x + 7\right)^{n} & \text{otherwise} \end{cases}\right)}{x + 7}$$
-256*Piecewise(((-7/16 - x/16)/(23/16 + x/16), |7/16 + x/16| < 1), (Sum((-1)^n*4^(-2*n)*(7 + x)^n, (n, 1, oo)), True))/(7 + x)

    Ejemplos de hallazgo de la suma de la serie