The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.3178\\[1 em]x_2 &= -0.3178\\[1 em]x_3 &= -3.1463\\[1 em]x_4 &= 3.1463 \end{aligned} $$Polynomial $ x^4-10x^2+1 $ has no rational roots that can be found using Rational Root Test, so the roots were found using quartic formulas.