Question
$$(x^2+9)(x^2-2x+8) = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} (x^2+9)(x^2-2x+8) &= 0&& \text{simplify left side} \\[1 em]x^4-2x^3+8x^2+9x^2-18x+72 &= 0&& \\[1 em]x^4-2x^3+17x^2-18x+72 &= 0&& \\[1 em] \end{aligned} $$
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using quartic formulas
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Equations Solver