# Limit calculus

1. May 6, 2009

### hugo.hribeiro

I was reviewing my concepts of limits and didnt manage to solve this one. Probably is simple but im not managing to get it.

Limit (2^x * (x + 1)) / (1 - 3^x)
+oo

i can see the answer is 0 but cant manage to get it...

2. May 6, 2009

### quasar987

Recall that $a^x=e^{\ln(a)x}$.

3. May 6, 2009

### hugo.hribeiro

yea, i remember that one...but still no luck in refactoring to a possible 0 result.

4. May 6, 2009

### Russell Berty

Divide top and bottom by 2^x.

5. May 7, 2009

### hugo.hribeiro

Got it... divide by 2^x and then divid again by x.

Thx people ;)