The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.636\\[1 em]x_2 &= -1.068+1.1036i\\[1 em]x_3 &= -1.068-1.1036i \end{aligned} $$Polynomial $ -2x^3-3x^2-2x+3 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.