The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 5.8216\\[1 em]x_2 &= 1.5892+1.7237i\\[1 em]x_3 &= 1.5892-1.7237i \end{aligned} $$Polynomial $ x^3-9x^2+24x-32 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.