Answer
$(x^n-5)(x^n+5)$
Work Step by Step
Using $a^2-b^2=(a+b)(a-b)$ or the factoring of the difference of 2 squares, then,
\begin{array}{l}
x^{2n}-25
\Rightarrow
(x^n-5)(x^n+5)
.\end{array}
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