1. The problem statement, all variables and given/known data integrate:13((4^x)+(3^x))dx 2. Relevant equations 3. The attempt at a solution I know the solution is 13((4^x)/ln(4) + (3^x)/ln(3)) + C Can someone explain to me how this works? I don't know where the ln's are coming from. How would I differentiate this back to the original function?