Find roots of polynomial $$ p(x) = x^3+12x^2+18x+42 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= -10.6831\\[1 em]x_2 &= -0.6585+1.8703i\\[1 em]x_3 &= -0.6585-1.8703i \end{aligned} $$Explanation
Polynomial $ x^3+12x^2+18x+42 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.
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