1. The problem statement, all variables and given/known data find the integral from 0 to 3 of (5x^2+30)/(x^4+13x^2+36) 2. Relevant equations 3. The attempt at a solution I thought it may be an integration by parts question, so I tried that first, but the book says that I should be using substitution. So I tried using u=x^2: du=2xdx x=u^(1/2) (5u+30)du/(u^2+13u+36)(2u^(1/2)) so now I have (5u+30)du/(2u^(5/2)+26u^(3/2)+72u^(1/2)) but i have no better idea how to integrate that than i did the original equation. any ideas?