The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.4239\\[1 em]x_2 &= 0.7881+1.0652i\\[1 em]x_3 &= 0.7881-1.0652i \end{aligned} $$Polynomial $ 4x^3-12x^2+16x-10 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.