The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -2.5445\\[1 em]x_2 &= 0.7723+1.8258i\\[1 em]x_3 &= 0.7723-1.8258i \end{aligned} $$Polynomial $ x^3+x^2+10 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.