# Chapter R - Algebra Reference - R.2 Factoring - R.2 Exercises: 23

$10(x-4)(x+4)$

#### 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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