[SOLVED] IVP and DE problem 1. The problem statement, all variables and given/known data 1) Find a solution to the IVP y" = -9y, y'(0) = 3, and y(0) = 6 2) Is y(x) = (21+6x)^1/3 a solution to the DE y' = 2/y^2 3. The attempt at a solution For the first one I think it has something to do with sin/cos but I don't know what to do. As for the second one maybe something with y=Ae^kt. Any help would be appreciated.