# Homework Help: Help with Integration

1. Oct 27, 2009

### henryc09

1. The problem statement, all variables and given/known data
Given that:

The integral between infinity and -infinity of

e-ax^2 dx = $$\sqrt{\pi/a}$$

show that

The integral between 0 and infinity of

x2.e-ax^2 dx = 1/4$$\sqrt{\pi/a^3}$$

2. Relevant equations

3. The attempt at a solution
don't really know where to start

2. Oct 27, 2009

### lurflurf

integrate by parts