Find roots of polynomial $$ p(x) = x^3-9x^2+12x+72 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -2.0656\\[1 em]x_2 &= 5.5328+2.0604i\\[1 em]x_3 &= 5.5328-2.0604i \end{aligned} $$Explanation
Polynomial $ x^3-9x^2+12x+72 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.
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