1. The problem statement, all variables and given/known data y''-4y=12x 2. Relevant equations I don't know 3. The attempt at a solution http://imageshack.us/a/img7/944/20130207102820.jpg [Broken] I'm not sure if I did this right, I'm putting this here to make sure. Please respond within 3 hours if you can because it will be due.