Ex. 1 : Solve (D2 - 4D + 3) y = x3 e^2x
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A.E. is m2 – 4m + 3 = 0 i.e., (m – 1) (m – 3) = 0 i.e., m = 1, 3 C.F. = C1 ex + C2 e3x
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