The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.4032\\[1 em]x_2 &= -0.5349+1.1694i\\[1 em]x_3 &= -0.5349-1.1694i \end{aligned} $$Polynomial $ 9x^3+6x^2+11x-6 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.