Find the general solution $of$ this ODE:

$\frac{d^{2}y}{d{t}^2}+9\frac{dy}{dt}+18y=4t^2+3+5e^{-7t}$

The solution will $beof$ the form:

$y(t)=C{y}_1(t)+D{y}_2(t)+y_p(t)$

$so$ use $C$ and $Das$ the arbitrary constants.

$y(t)$