Here are two problems iam having. I'm not sure how to go about solving the first one, as when its just numbers its soo much easier!! When theres x's and y's I dont know how to begin..

Here they are;

variation of parameters, given that a solution is y=x

$\displaystyle

x^2 y'' + x(x - 2)y' - (x - 2)y = x^3

$

Also,

find complete general solution

$\displaystyle

y'' + 4y = x + e^2x

$