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Suma de la serie (3^n+(-2)^n)/n(x+1)^n



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Solución

Ha introducido [src]
  oo                     
____                     
\   `                    
 \     n       n         
  \   3  + (-2)         n
  /   ----------*(x + 1) 
 /        n              
/___,                    
n = 1                    
$$\sum_{n=1}^{\infty} \frac{\left(-2\right)^{n} + 3^{n}}{n} \left(x + 1\right)^{n}$$
Sum(((3^n + (-2)^n)/n)*(x + 1)^n, (n, 1, oo))
Respuesta [src]
//(-2 - 2*x)*log(3 + 2*x)                              \   //-(3 + 3*x)*log(-2 - 3*x)                               \
||-----------------------  for And(x <= -1/2, x > -3/2)|   ||-------------------------  for And(x >= -4/3, x < -2/3)|
||       2*(1 + x)                                     |   ||        3*(1 + x)                                      |
||                                                     |   ||                                                       |
||   oo                                                |   ||      oo                                               |
|| ____                                                |   ||    ____                                               |
|< \   `                                               | + |<    \   `                                              |
||  \        n        n                                |   ||     \     n        n                                  |
||   \   (-2) *(1 + x)                                 |   ||      \   3 *(1 + x)                                   |
||   /   --------------             otherwise          |   ||      /   -----------               otherwise          |
||  /          n                                       |   ||     /         n                                       |
|| /___,                                               |   ||    /___,                                              |
\\ n = 1                                               /   \\    n = 1                                              /
$$\begin{cases} \frac{\left(- 2 x - 2\right) \log{\left(2 x + 3 \right)}}{2 \left(x + 1\right)} & \text{for}\: x \leq - \frac{1}{2} \wedge x > - \frac{3}{2} \\\sum_{n=1}^{\infty} \frac{\left(-2\right)^{n} \left(x + 1\right)^{n}}{n} & \text{otherwise} \end{cases} + \begin{cases} - \frac{\left(3 x + 3\right) \log{\left(- 3 x - 2 \right)}}{3 \left(x + 1\right)} & \text{for}\: x \geq - \frac{4}{3} \wedge x < - \frac{2}{3} \\\sum_{n=1}^{\infty} \frac{3^{n} \left(x + 1\right)^{n}}{n} & \text{otherwise} \end{cases}$$
Piecewise(((-2 - 2*x)*log(3 + 2*x)/(2*(1 + x)), (x <= -1/2)∧(x > -3/2)), (Sum((-2)^n*(1 + x)^n/n, (n, 1, oo)), True)) + Piecewise((-(3 + 3*x)*log(-2 - 3*x)/(3*(1 + x)), (x >= -4/3)∧(x < -2/3)), (Sum(3^n*(1 + x)^n/n, (n, 1, oo)), True))

    Ejemplos de hallazgo de la suma de la serie