The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 8.1448\\[1 em]x_2 &= -4.0724+10.4763i\\[1 em]x_3 &= -4.0724-10.4763i \end{aligned} $$Polynomial $ -x^3-60x+1029 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.