The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -0.8907\\[1 em]x_2 &= 0.9454+0.889i\\[1 em]x_3 &= 0.9454-0.889i \end{aligned} $$Polynomial $ 2x^3-2x^2+3 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.