The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 2.1017\\[1 em]x_2 &= -0.0508+0.8433i\\[1 em]x_3 &= -0.0508-0.8433i \end{aligned} $$Polynomial $ 2x^3-4x^2+x-3 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.