Answer
(x-5+y)(x-5-y)
Work Step by Step
$x^{2}$-10x+25-$y^{2}$=($x^{2}$-2*x*5x+25)-$y^{2}$=
$(x-5)^{2}$-$y^{2}$=(x-5+y)(x-5-y)
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