Ordinary Differential Equations/Non Homogenous 3

Solve

1. $y^{″}-y=e^{-x},x\in ℝ,y(0)=y^{\prime }(0)=0$

Find Particular Integral

1. $y^{″}-7y+12y=24e^x$
2. $y^{″}+4y^{\prime }+4y=e^{-2x}$