1. The problem statement, all variables and given/known data Evaluate the definite integral from 0 to 18. ∫[x/(9+4x)^1/2]dx 2. Relevant equations 3. 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 incorrect.