# Math Help - solve my limit problem

1. ## solve my limit problem

Calculate lim of〖xe^(-x) 〗when (x→∞ ) using an appropriate rule and proves that it exist and it is equals to zero.
Help me solving this problem!

2. Clarification: do the weird brackets around xe^(-x) mean anything?

3. nope, sorry for that. the question is...
Calculate lim of [xe^(-x)] when (x→∞ ) using an appropriate rule and proves that it exist and it is equals to zero.

4. Originally Posted by Salman91
nope, sorry for that. the question is...
Calculate lim of [xe^(-x)] when (x→∞ ) using an appropriate rule and proves that it exist and it is equals to zero.
Use L'Hopitals rule after rewriting as:

$\displaystyle \lim_{x\to \infty}\dfrac{x}{e^x}$

CB