I need to find the solution for these differential equations:
1) [(D^2)+D]y = x^2 + 3x + e^3x
2) y'' + 4y = 8cos2x -4x
I know their complementary functions which are
1) yc = c1+c2e^-x
2) yc = c1cos2x +c2sin2x
But I don't know how to get the particular functions to find the solution. Please help!!!

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familiar with the method of undetermined coefficients ?

yep. but i'm quite confused on how to use that

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