# Math Help - power series

1. ## power series

i mostly know how to do these, but i don't know what to do for a specific problem.
i did the ratio test and took the limit as n goes to infinity, and ended up with
x+5. to find the radiance of convergence, everything i've seen is about x-a, nothing about what to do with x+a. could i just change it to x-(-5)? or is there something special that needs to be done?

2. Originally Posted by isuckatcalc
i mostly know how to do these, but i don't know what to do for a specific problem.
i did the ratio test and took the limit as n goes to infinity, and ended up with
x+5. to find the radiance of convergence, everything i've seen is about x-a, nothing about what to do with x+a. could i just change it to x-(-5)? or is there something special that needs to be done?
$|x+5| < 1$

$-1 < x+5 < 1$

$-6 < x < -4$

check the endpoints in the nth term for possible inclusion in the interval of convergence.