The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.1852\\[1 em]x_2 &= -1.2593+0.4626i\\[1 em]x_3 &= -1.2593-0.4626i \end{aligned} $$Polynomial $ 3x^3+7x^2+4x-1 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.