The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.5293\\[1 em]x_2 &= -1.3429\\[1 em]x_3 &= 2.8136 \end{aligned} $$Polynomial $ x^3-2x^2-3x+2 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.