Answer
$(x-y-5)(x+y+5)$
Work Step by Step
RECALL:
$A^2-B^2=(A-B)(A+B)$
Factor the difference of two squares using the formula above with $A=x$ and $B=y+5$ to obtain:
$=[x-(y+5)][x+(y+5)]
\\=(x-y-5)(x+y+5)$
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