The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 7.7629\\[1 em]x_2 &= -1.3814+0.7343i\\[1 em]x_3 &= -1.3814-0.7343i \end{aligned} $$Polynomial $ x^3-5x^2-19x-19 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.