The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -3.4787\\[1 em]x_2 &= -0.2607+2.6681i\\[1 em]x_3 &= -0.2607-2.6681i \end{aligned} $$Polynomial $ x^3+4x^2+9x+25 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.