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Suma de la serie ((x+5)^(2n-1))/4^n*(2n-1)



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Solución

Ha introducido [src]
  oo                          
____                          
\   `                         
 \           2*n - 1          
  \   (x + 5)                 
   )  --------------*(2*n - 1)
  /          n                
 /          4                 
/___,                         
n = 1                         
$$\sum_{n=1}^{\infty} \frac{\left(x + 5\right)^{2 n - 1}}{4^{n}} \left(2 n - 1\right)$$
Sum(((x + 5)^(2*n - 1)/4^n)*(2*n - 1), (n, 1, oo))
Respuesta [src]
                                                //              2             |       2|    \
                                                ||       (5 + x)              |(5 + x) |    |
  /             2            |       2|         ||  -----------------     for ---------- < 1|
  |      (5 + x)             |(5 + x) |         ||                  2             4         |
  |  ----------------    for ---------- < 1     ||    /           2\                        |
  |    /           2\            4              ||    |    (5 + x) |                        |
  |    |    (5 + x) |                           ||  4*|1 - --------|                        |
  |  4*|1 - --------|                           ||    \       4    /                        |
  |    \       4    /                         2*|<                                          |
  <                                             ||  oo                                      |
  |  oo                                         || ___                                      |
  | ___                                         || \  `                                     |
  | \  `                                        ||  \      -n        2*n                    |
  |  \    -n        2*n                         ||  /   n*4  *(5 + x)         otherwise     |
  |  /   4  *(5 + x)         otherwise          || /__,                                     |
  | /__,                                        ||n = 1                                     |
  \n = 1                                        \\                                          /
- ----------------------------------------- + -----------------------------------------------
                    5 + x                                          5 + x                     
$$\frac{2 \left(\begin{cases} \frac{\left(x + 5\right)^{2}}{4 \left(1 - \frac{\left(x + 5\right)^{2}}{4}\right)^{2}} & \text{for}\: \frac{\left|{\left(x + 5\right)^{2}}\right|}{4} < 1 \\\sum_{n=1}^{\infty} 4^{- n} n \left(x + 5\right)^{2 n} & \text{otherwise} \end{cases}\right)}{x + 5} - \frac{\begin{cases} \frac{\left(x + 5\right)^{2}}{4 \left(1 - \frac{\left(x + 5\right)^{2}}{4}\right)} & \text{for}\: \frac{\left|{\left(x + 5\right)^{2}}\right|}{4} < 1 \\\sum_{n=1}^{\infty} 4^{- n} \left(x + 5\right)^{2 n} & \text{otherwise} \end{cases}}{x + 5}$$
-Piecewise(((5 + x)^2/(4*(1 - (5 + x)^2/4)), Abs((5 + x)^2)/4 < 1), (Sum(4^(-n)*(5 + x)^(2*n), (n, 1, oo)), True))/(5 + x) + 2*Piecewise(((5 + x)^2/(4*(1 - (5 + x)^2/4)^2), Abs((5 + x)^2)/4 < 1), (Sum(n*4^(-n)*(5 + x)^(2*n), (n, 1, oo)), True))/(5 + x)

    Ejemplos de hallazgo de la suma de la serie