The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -1.4656\\[1 em]x_2 &= 0.2328+0.7926i\\[1 em]x_3 &= 0.2328-0.7926i \end{aligned} $$Polynomial $ x^3+x^2+1 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.