The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.438\\[1 em]x_2 &= -0.969+2.431i\\[1 em]x_3 &= -0.969-2.431i \end{aligned} $$Polynomial $ 2x^3+3x^2+12x-6 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.