The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.0332\\[1 em]x_2 &= -3.0053\\[1 em]x_3 &= 0.3096+0.8112i\\[1 em]x_4 &= 0.3096-0.8112i\\[1 em]x_5 &= -1.3235+1.1131i\\[1 em]x_6 &= -1.3235-1.1131i \end{aligned} $$Polynomial $ x^6+4x^5+3x^4-2x^3-4x^2+4x-7 $ has no rational roots that can be found using Rational Root Test, so the roots were found using Newton method.