The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 9.7083\\[1 em]x_2 &= -17.1885\\[1 em]x_3 &= 3.7401+2.6146i\\[1 em]x_4 &= 3.7401-2.6146i \end{aligned} $$Polynomial $ x^4-202x^2+1404x-3475 $ has no rational roots that can be found using Rational Root Test, so the roots were found using quartic formulas.