The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -0.1006\\[1 em]x_2 &= -1.0497+0.9418i\\[1 em]x_3 &= -1.0497-0.9418i \end{aligned} $$Polynomial $ 5x^3+11x^2+11x+1 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.