Answer
$(x-5a)(x+5a)+8(x+2)$
Work Step by Step
$ x^{2}+8x+16-25a^{2}\qquad$...factor in pairs.
$=(x^{2}-25a^{2})+(8x+16)\qquad$...recognize the difference of two squares: $a^{2}-b^{2}=(a-b)(a+b)$
$=(x-5a)(x+5a)+8(x+2)$
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