Solve the ODE below for the given initial conditions using undetermined coefficients. Use x\displaystyle {x} as the independent variable.

y+4y+4y=4t+9\displaystyle {y}{''}+{4}{y}'+{4}{y}={4}{t}+{9}

y(0)=294,y(0)=11\displaystyle {y}{\left({0}\right)}=\frac{{29}}{{4}},\quad{y}'{\left({0}\right)}=-{11}

y(x)=\displaystyle {y}{\left({x}\right)}=