The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -0.1857\\[1 em]x_2 &= -1.6571+1.6243i\\[1 em]x_3 &= -1.6571-1.6243i \end{aligned} $$Polynomial $ 2x^3+7x^2+12x+2 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.