1. ## 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.

2. 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.