Answer
$2(8-y)(8+y)$
Work Step by Step
$ 128-2y^{2}\qquad$....factor out $2$.
$=2(64-y^{2})\qquad$...recognize the difference of two squares: $a^{2}-b^{2}=(a-b)(a+b)$
$=2(8-y)(8+y)$
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