The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.4587\\[1 em]x_2 &= -4.6606\\[1 em]x_3 &= 2.9769\\[1 em]x_4 &= -5.3649\\[1 em]x_5 &= 6.5898 \end{aligned} $$Polynomial $ 2x^5-103x^3-38x^2+1020x-450 $ has no rational roots that can be found using Rational Root Test, so the roots were found using Newton method.