The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.455+0.455i\\[1 em]x_2 &= 0.455-0.455i\\[1 em]x_3 &= -0.455+0.455i\\[1 em]x_4 &= -0.455-0.455i \end{aligned} $$Polynomial $ 35x^4+6 $ has no rational roots that can be found using Rational Root Test, so the roots were found using quartic formulas.