The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.416\\[1 em]x_2 &= -0.1247+0.581i\\[1 em]x_3 &= -0.1247-0.581i \end{aligned} $$Polynomial $ 12x^3-14x^2-6 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.