1. The problem statement, all variables and given/known data y'' + 9y = 2x2e3x + 5 2. Relevant equations N/A 3. The attempt at a solution I think the complementary solution yc = c1cos(3x) + c2sin(3x). If not for that little +5 at the end of the right hand side, I'm pretty sure I could solve it. But I don't know how to include it in my solution.