# Chapter 5 - Review: 108

$a^2-4b^2$

#### Work Step by Step

The product of the sum and difference of two terms is the square of the first term minus the square of the second term. $(a + b)(a - b) = a^2 - b^2$ $(a+2b)(a-2b)=(a)^2-(2b)^2=a^2-4b^2$

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