The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.898\\[1 em]x_2 &= 3.9491\\[1 em]x_3 &= -0.0235+0.5305i\\[1 em]x_4 &= -0.0235-0.5305i \end{aligned} $$Polynomial $ 5x^4-24x^3+18x^2-6x+5 $ has no rational roots that can be found using Rational Root Test, so the roots were found using quartic formulas.