1. The problem statement, all variables and given/known data Integrate -9e^x - 28 / e^2x + 9e^x + 14 It gives a hint which is substitute u = e^x. 2. Relevant equations 3. The attempt at a solution I want to integrate by partial fractions if possible... however before I can do that, I need to make the substitution, and I can't figure out how. If I take u = e^x, then du=e^x dx . But I have no e^x dx by itself in my equation to replace?