The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -2.2092\\[1 em]x_2 &= 2.2092\\[1 em]x_3 &= 6.0729i\\[1 em]x_4 &= -6.0729i \end{aligned} $$Polynomial $ x^4+32x^2-180 $ has no rational roots that can be found using Rational Root Test, so the roots were found using quartic formulas.