Question
$$x^4+7^3-8x-56 = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} x^4+7^3-8x-56 &= 0&& \text{simplify left side} \\[1 em]x^4+343-8x-56 &= 0&& \\[1 em]x^4-8x+287 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using quartic formulas
This page was created using
Polynomial Equations Solver