The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 4.4105\\[1 em]x_2 &= 0.6532+0.8211i\\[1 em]x_3 &= 0.6532-0.8211i\\[1 em]x_4 &= -0.3585+1.0523i\\[1 em]x_5 &= -0.3585-1.0523i \end{aligned} $$Polynomial $ x^5-5x^4+4x^3-7x^2+5x-6 $ has no rational roots that can be found using Rational Root Test, so the roots were found using Newton method.