1. The problem statement, all variables and given/known data Evalute the integral ∫ [x / 1 + x] dx 2. Relevant equations ∫ [x / 1 + x] dx 3. The attempt at a solution I forgot how to do solve this type of integral, or never had enough practice. And this problem is actually for a physics problem :-) And my algebra is very rusty as well. ∫ [x / 1 + x] dx Can't do U-sub, don't think you can do by parts, can't do trig substitution, not sure about partial fractions Divide everything by 'x'. ∫ [x / 1 + x] dx = ∫ [x (1 / x)/ 1(1 / x) + x(1 / x)] dx ∫ [1 / (1/x) + (1)] dx Not sure where to go from here.