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second order differential equations with constant coefficients

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Undetermined coefficients 2001-11-22

Hoda pose la question :
The equation is:
y" - 2y' + y = t e^t + 4

We need to use The method of Undetermined coefficients. I have tried assuming that the solution is Ate^t+Be^t+C, but all I get is C=4 and I tried (At²+Bt+C)e^t+D, but again I get 0=0 when I calculate the first and second derivatives, so i get no information on the constants. Any suggestions?

Harley Weston lui répond.

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