# Math Help - U substitution help

1. ## U substitution help

I don't understand what happens to the du for u subsitution when solving for integrals. I understand that u is the innermost function and the antiderivative of it is what we need to find to solve the intergral but what happens to the du?

2. ## Re: U substitution help

After the substitution you are integrating with respect to du. After you have integrated, it disapears, just like a dx does.