The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 3.4892\\[1 em]x_2 &= -0.7446+4.0794i\\[1 em]x_3 &= -0.7446-4.0794i \end{aligned} $$Polynomial $ x^3-2x^2+12x-60 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.