The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.2117\\[1 em]x_2 &= 0.1442+1.2767i\\[1 em]x_3 &= 0.1442-1.2767i \end{aligned} $$Polynomial $ 2x^3-3x^2+4x-4 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.