(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I hav been trying to solve this differential equation by Method of Undetermined Coefficients for a long time.

y"-2y'-3y=-3te^(-t) ....................

We are supposed to guess a solution then differentiate and go from there. I guessed

y = (At + B)e^(-t) ............. but this does not work. ........... can someone help me on this ... I have also tried y = Ae^(-t) but this also doesnt work. Is it possible the book answer is wrong ?

2. Relevant equations

3. The attempt at a solution

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# Differential Equation Method OF UNDETERMINED COEFF

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