The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.164\\[1 em]x_2 &= -1.4526\\[1 em]x_3 &= 0.1443+1.3242i\\[1 em]x_4 &= 0.1443-1.3242i \end{aligned} $$Polynomial $ x^4+x-3 $ has no rational roots that can be found using Rational Root Test, so the roots were found using quartic formulas.