Math Help - Second-Order Linear Nonhomogeneous DE with Constant Coefficients

1. Second-Order Linear Nonhomogeneous DE with Constant Coefficients

Y+ 4Y` + 3y = 3x^2 - 1

Need help with this diff equation. I have tried with Ax^2 + Bx + C but it is not working. I cant get the right answer.

Thank you for helping me

2. We don't know if your doubt is related to the general solution of the homogeneous equation or to the particular solution of the complete.

3. I just solved it now. Thank you anyway =)