Find roots of polynomial $$ p(x) = 2x^3+7x^2+2x+9 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -3.5727\\[1 em]x_2 &= 0.0363+1.1217i\\[1 em]x_3 &= 0.0363-1.1217i \end{aligned} $$Explanation
Polynomial $ 2x^3+7x^2+2x+9 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.
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