Find roots of polynomial $$ p(x) = x^4+x^3+5x^2+7 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 0.2973+1.2358i\\[1 em]x_2 &= 0.2973-1.2358i\\[1 em]x_3 &= -0.7973+1.9227i\\[1 em]x_4 &= -0.7973-1.9227i \end{aligned} $$Explanation
Polynomial $ x^4+x^3+5x^2+7 $ has no rational roots that can be found using Rational Root Test, so the roots were found using quartic formulas.
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