# Double Integral Help

• Oct 12th 2006, 10:41 AM
GmasterFlash13
Double Integral Help
I have a question in my Prob & Stat course that deals with double integration, and it's been two years since Calc III and I really don't remember exactly how to solve one. Here's the question:

The first part isn't really a double integral, but will eventually lead to one:

Integral ( xe^(-x(1+y) ) ) dy

Essentially, I am not sure how to integrate that for y. The bounds don't really matter in this case, I need to know the y-integration.

To anyone who can help, it'd be much appreciated. Thanks.
• Oct 12th 2006, 12:59 PM
topsquark
Quote:

Originally Posted by GmasterFlash13
I have a question in my Prob & Stat course that deals with double integration, and it's been two years since Calc III and I really don't remember exactly how to solve one. Here's the question:

The first part isn't really a double integral, but will eventually lead to one:

Integral ( xe^(-x(1+y) ) ) dy

Essentially, I am not sure how to integrate that for y. The bounds don't really matter in this case, I need to know the y-integration.

To anyone who can help, it'd be much appreciated. Thanks.