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Use the method of undetermined coefficients (it works the same way for a fourth order linear...

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Advance Math

Use the method of undetermined coefficients (it works the sameway for a fourth order linear equation) to find the generalsolution of:

y(4) - 18y'' + 81y = 6t2 - 4t + 36 +90e3t

[Hint: The complementary solution is yc =C1e3t + C2e-3t +C3te3t + C4te-3t

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