The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -0.8393\\[1 em]x_2 &= 1.4196+0.6063i\\[1 em]x_3 &= 1.4196-0.6063i \end{aligned} $$Polynomial $ x^3-2x^2+2 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.