Solve Limit Calc Problem: 3^(2x) - 1 / 3^(2x) + 1

[FrostScYthe]

Hi, I did this limit, I know what it is by intuition, I just don't know how to mathematically calculate it.

lim 3^(2x) - 1
x->-inf ---------- = -1
3^(2x) + 1

 

[tmc]

use l'hopital's rule

 

[hypermorphism]

What is the limit as (x -> -infty) of 3^x ?