The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 3.2388\\[1 em]x_2 &= -0.8694+1.9687i\\[1 em]x_3 &= -0.8694-1.9687i \end{aligned} $$Polynomial $ -2x^3+3x^2+2x+30 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.