Need to find the general solution q(t) of q''+ 6q'+ 9q = (t^2)*(e^(-3t)) I think it goes of finding solution of the form P(t)*e^(-3t) with P polynomial of degree 4. But not totally sure how to continue. Thank you for your assistance.
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Originally Posted by taurine330 Need to find the general solution q(t) of q''+ 6q'+ 9q = (t^2)*(e^(-3t)) solve the homogeneous. the characteristic equation is so we have equal roots and the solution is see my second link to find the particular solution.
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