# Chapter 6 - Section 6.5 - Factoring by Special Products - Exercise Set - Page 447: 51

(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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