The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.0472\\[1 em]x_2 &= -0.2736+0.7058i\\[1 em]x_3 &= -0.2736-0.7058i \end{aligned} $$Polynomial $ 10x^3-5x^2-6 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.