The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 2.1304\\[1 em]x_2 &= -0.5652+1.0434i\\[1 em]x_3 &= -0.5652-1.0434i \end{aligned} $$Polynomial $ x^3-x^2-x-3 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.