The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.1336\\[1 em]x_2 &= -0.2335+0.3762i\\[1 em]x_3 &= -0.2335-0.3762i \end{aligned} $$Polynomial $ 9x^3-6x^2-3x-2 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.