Recent content by purdue2016

I finally got it using the substitution I mentioned. I think I was screwing up because I didn't change the limits of integration for the new variable. Thanks for the help.

Homework Statement Evaluate the definite integral from 0 to 18. ∫[x/(9+4x)^1/2]dx Homework Equations The Attempt at a Solution I know to use u-substitution and I set u = (9+4x)^1/2. I can't figure out where I'm messing up because I keep ending up with very large numbers which are...