The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 2.3532\\[1 em]x_2 &= 0.8234+1.2028i\\[1 em]x_3 &= 0.8234-1.2028i \end{aligned} $$Polynomial $ -x^3+4x^2-6x+5 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.