# integration interval

Fragment of a discussion from Science talk:Math Exam Resources/Courses/MATH103

Hi. Substitution is the only time you change the limits of the integral. Your sample substitution is correct. Maybe 16 is a large number, but maybe the problem in this case would ask you to divide the answer by 8, say, making it much easier to handle. I wouldn't worry about simplifying too much, that's at most one mark out of the total marks for any question.