The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.1622\\[1 em]x_2 &= -0.4291+0.9444i\\[1 em]x_3 &= -0.4291-0.9444i\\[1 em]x_4 &= 1.848+1.1759i\\[1 em]x_5 &= 1.848-1.1759i \end{aligned} $$Polynomial $ x^5-4x^4+6x^3-3x^2+5x-6 $ has no rational roots that can be found using Rational Root Test, so the roots were found using Newton method.