Answer
$10(x-4)(x+4)$
Work Step by Step
Factor out 10 to have:
$=10(x^2-16)$
Write $16$ as a square to have:
$=10(x^2-4^2)$
RECALL:
$a^2-b^2=(a-b)(a+b)$
Factor using the formula above to have:
$=10(x-4)(x+4)$
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