## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson

# Chapter 4 - Polynomials - 4.7 Polynomials in Several Variables - 4.7 Exercise Set - Page 284: 60

#### Answer

$a^2-2ar+r^2$

#### Work Step by Step

Using $(a+b)^2=a^2+2ab+b^2$ or the square of a binomial, the given expression, $(a-r)^2 ,$ simplifies to \begin{array}{l}\require{cancel} (a)^2+2(a)(-r)+(-r)^2 \\\\= a^2-2ar+r^2 .\end{array}

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