Find roots of polynomial $$ p(x) = 2x^3-21x-40 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 3.9457\\[1 em]x_2 &= -1.9729+1.0847i\\[1 em]x_3 &= -1.9729-1.0847i \end{aligned} $$Explanation
Polynomial $ 2x^3-21x-40 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.
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