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## Homework Statement

solve:

y""+6y'+9y=e

^{-3x}/x

^{3}

## Homework Equations

y=y

_{c}+y

_{p}

## The Attempt at a Solution

I found y

_{c}=C

_{1}e

^{-3x}+C

_{2}xe

^{-3x}

and am having difficulties finding yp. I am wondering which method would be the best to determine y

_{p}:

- annihilators

- undetermined coefficients

- variation of paramaters.