The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -157.1748\\[1 em]x_2 &= 28.5874+110.8566i\\[1 em]x_3 &= 28.5874-110.8566i \end{aligned} $$Polynomial $ x^3+100x^2+4120x+2060000 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.