The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= i\\[1 em]x_2 &= -i\\[1 em]x_3 &= 5i\\[1 em]x_4 &= -5i \end{aligned} $$Polynomial $ x^4+26x^2+25 $ has no rational roots that can be found using Rational Root Test, so the roots were found using quartic formulas.