The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.8767\\[1 em]x_2 &= -1.3194\\[1 em]x_3 &= 4.4427 \end{aligned} $$Polynomial $ x^3-5x^2+11 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.