The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -0.1047\\[1 em]x_2 &= -0.3693\\[1 em]x_3 &= -0.306+0.7009i\\[1 em]x_4 &= -0.306-0.7009i\\[1 em]x_5 &= 0.6859+0.7629i\\[1 em]x_6 &= 0.6859-0.7629i \end{aligned} $$Polynomial $ 42x^6-12x^5+20x^4+8x^3+24x^2+12x+1 $ has no rational roots that can be found using Rational Root Test, so the roots were found using Newton method.