The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -1.1654\\[1 em]x_2 &= 0.5827+0.7201i\\[1 em]x_3 &= 0.5827-0.7201i \end{aligned} $$Polynomial $ 2x^3-x+2 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.