Solve

y6y+25y=0,y(0)=2,y(0)=18\displaystyle {y}{''}-{6}{y}'+{25}{y}={0},\quad{y}{\left({0}\right)}=-{2},\quad{y}'{\left({0}\right)}=-{18}

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

The behavior of the solutions are: