Super Easy

Thank you so much.
1- Use the method of undetermined coefficients to find one solution of: y”- y’- y = 2e^(2t)
y(t) = ?
2- Find the solution of y” 7y’ = 392 sin(7t) 392 cos(7t)
with y(0) = 2 and y'(0) = 9
y = ?