Hi,

I have a function f(x) and I need to find this limit:

$\displaystyle \lim_{x\to \infty }\frac{f(x)}{(x+1)^3}=?$

(Actually, in my case f(x) is a sequence i.e. what I am calling f(x) is actually $\displaystyle \sum_{n=0}^{x}a_n$ I don't know if this makes a big difference or not.)

Can someone point in the right direction please?

Thanks