Solve \( y'' + y' - 12y = xe^x \).
second-order-linear-odenon-homogeneous-odeconstant-coefficientsundetermined-coefficientsauxiliary-equationcharacteristic-equationexponential-functionpolynomial-functiondifferential-equationscalculus-iiordinary-differential-equationsparticular-solutiongeneral-solution
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