Find roots of polynomial $$ p(x) = -x^3-x^2+15x+63 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 4.8214\\[1 em]x_2 &= -2.9107+2.1436i\\[1 em]x_3 &= -2.9107-2.1436i \end{aligned} $$Explanation
Polynomial $ -x^3-x^2+15x+63 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.
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