# Math Help - Interval of Convergence Problem

1. ## Interval of Convergence Problem

How do i find the interval of convergence for the summation of 1 to infinity for (x+2)N/N3 ?

2. ## Re: Interval of Convergence Problem

Use the ratio test. The n+1 term divided by the nth term.

3. ## Re: Interval of Convergence Problem

Thanks, I've done that and gotten (X+2). How do I use that to determine the interval of convergence?

4. ## Re: Interval of Convergence Problem

Originally Posted by JRH
Thanks, I've done that and gotten (X+2). How do I use that to determine the interval of convergence?
Can you solve $|x+2|<1~?$
Be sure to test the endpoints!