
Bobosharif S. answered 03/19/18
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Mathematics/Statistics Tutor
The general solution looks good, but you have to look for a particular solution in the form
Yp(x) = Ax3 + Bx2 + Cx +D. (not -5 instead of D).
It seems to me that you are making progress. Good luck.

Bobosharif S.
Yp(x) is a particular solution of the inhomogeneous equation and the general solution of the equation is yG(x)=y(x)+yp(x). Initial conditions y(0)=6 and y'(0)=0 are for the general solution yG(x)
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03/19/18
Phantom L.
03/19/18