1. The problem statement, all variables and given/known data solve: y""+6y'+9y=e-3x/x3 2. Relevant equations y=yc+yp 3. The attempt at a solution I found yc=C1e-3x+C2xe-3x and am having difficulties finding yp. I am wondering which method would be the best to determine yp: - annihilators - undetermined coefficients - variation of paramaters.