Radius of convergence / endpoints

I am really having trouble with this problem. The n'th term is given in the problem,

http://www.webassign.net/www22/symIm...fc23e2e01e.gif

(a) Determine the radius of convergence of the series.

(b) What are the endpoints of the interval of convergence?

left endpoint = x =

right endpoint = x =

Does the series converge at the left endpoint?

Does the series converge at the right endpoint?

I did the ratio test and got [(-1^n)*(x^n+1) / (n+1)] * [n / -1^(n-1) * x^n]

I get infinity when i get an x in the numerator when i take the limit. Usually the x's cancel out. is this a special case? maybe i am doing something wrong, or don't know something. And I have no clue on how to find the end points even.

Please help. Thank you.