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Homework Statement
y'' + 3y' + 2y = 24exp(-2x)
Homework Equations
y'' + 3y' + 2y = 24exp(-2x)
The Attempt at a Solution
I've solved the characteristic equation and am after the particular solution.
I've let y_p = Aexp(-2x), y_p' = -2Axexp(-2x) and y_p'' = 4Axexp(-2x)
When substituting these terms into the original D.E., I end up with A = 0.
What have I done wrong?