The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 13.0177\\[1 em]x_2 &= -0.0089+0.48i\\[1 em]x_3 &= -0.0089-0.48i \end{aligned} $$Polynomial $ 2x^3-26x^2-6 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.