Find roots of polynomial $$ p(x) = -4x^4-8x^3+7x^2+11x+12 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.4587\\[1 em]x_2 &= -2.4587\\[1 em]x_3 &= -0.5+0.7658i\\[1 em]x_4 &= -0.5-0.7658i \end{aligned} $$Explanation
Polynomial $ -4x^4-8x^3+7x^2+11x+12 $ has no rational roots that can be found using Rational Root Test, so the roots were found using quartic formulas.
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