Method of Variation and Green Function: d^2y/dx^2 + 4y = -e^x, 0<x<L, y(0) = y(L) = 0

[topsquark]

What part did you believe, topsquark? You know me and you know my math level better than anyone else.

I still need help to solve post #1.

You have been told what we expect you to do. If you don't want to do it, that's your problem.

-Dan