Answer
$32$
Work Step by Step
Using order of operations, the given expression, $
\dfrac{(5^2-3^2)^2}{2\cdot6-4}
$, evaluates to
\begin{array}{l}
\dfrac{(25-9)^2}{12-4}
\\\\=
\dfrac{(16)^2}{8}
\\\\=
\dfrac{256}{8}
\\\\=
32
.\end{array}