Question
$$(4x^2+5)(4x^2+5) = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} (4x^2+5)(4x^2+5) &= 0&& \text{simplify left side} \\[1 em]16x^4+20x^2+20x^2+25 &= 0&& \\[1 em]16x^4+40x^2+25 &= 0&& \\[1 em] \end{aligned} $$
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