Answer
$(6x^n+7)(6x^n-7)$
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}
36x^{2n}-49
\Rightarrow
(6x^n+7)(6x^n-7)
.\end{array}
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