# Chapter 7 - Section 7.5 - Multiplying and Dividing Radical Expressions - 7.5 Exercises: 11

$-2$

#### Work Step by Step

$\bf{\text{Solution Outline:}}$ To simplify the given radical expression, $(\sqrt{7}+3)(\sqrt{7}-3) ,$ use the special product on multiplying the sum and difference of like terms. $\bf{\text{Solution Details:}}$ Using the product of the sum and difference of like terms which is given by $(a+b)(a-b)=a^2-b^2,$ the expression above is equivalent\begin{array}{l}\require{cancel} (\sqrt{7})^2-(3)^2 \\\\= 7-9 \\\\= -2 .\end{array}

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