The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.2932\\[1 em]x_2 &= -1.3966+5.1635i\\[1 em]x_3 &= -1.3966-5.1635i \end{aligned} $$Polynomial $ 2x^3+3x^2+50x-74 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.