The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -0.2442\\[1 em]x_2 &= 1.1221+0.8882i\\[1 em]x_3 &= 1.1221-0.8882i \end{aligned} $$Polynomial $ 2x^3-4x^2+3x+1 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.