ok so here is the problem

y'' +3y = -48(x^2)(e^3x)

ok so i get the first few couple of steps,

m^2 +3 = 0, m = +/- sqrt(3)i

so Yc = C1cos sqrt(3)x + C2sin sqrt(3)x

Yp = (Ax^2 +Bx + C)e^3x

so how do i find Yp? well let me ask first, is my setup right so far?

i need a lil help on this one....