1. The problem statement, all variables and given/known data Solve this equation using power series: y'' + y = x 2. Relevant equations none 3. The attempt at a solution I am confused about the x on the RHS of the equation. If the equation was y'' + y = 0, I would have no problem solving it. I am just a little confused about how the x fits into the equation for cn. if the equation were y'' + y = 0, then cn + 2 = cn/(n+1)(n+2). How does the x fit into this?