Find roots of polynomial $$ p(x) = -x^3+56x-91 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1.7151\\[1 em]x_2 &= 6.4769\\[1 em]x_3 &= -8.192 \end{aligned} $$Explanation
Polynomial $ -x^3+56x-91 $ has no rational roots that can be found using Rational Root Test, so the roots were found using qubic formulas.
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