Question
$$-x^3+6x^2+51x+40+64x+320+16x+80 = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} -x^3+6x^2+51x+40+64x+320+16x+80 &= 0&& \text{simplify left side} \\[1 em]-x^3+6x^2+131x+440 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using qubic formulas.
This page was created using
Polynomial Equations Solver