The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -0.3822\\[1 em]x_2 &= -0.8848\\[1 em]x_3 &= -5.6511\\[1 em]x_4 &= -13.0819 \end{aligned} $$Polynomial $ x^4+20x^3+98x^2+100x+25 $ has no rational roots that can be found using Rational Root Test, so the roots were found using quartic formulas.