Since I was quarantined due to the swine flu, I missed this part of my Calc 2 class. I've done some problems dealing with convergence and divergence of series, but I've never done one with two variables. Is there a certain way to go about it, or are there multiple ways? Which do you think is best?

Such as

$\displaystyle \sum_{n=1}^{\infty}\frac{x^n}{5^n}$

or

$\displaystyle \sum_{n=0}^{\infty} (x+1)^{n}3^{n} $

I think I'm finally getting this Latex stuff down

Thanks sooo much!