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

Published by Pearson

# Chapter 5 - Polynomials and Factoring - 5.4 Factoring Perfect-Square Trinomials and Differences of Squares - 5.4 Exercise Set: 11

#### Answer

a perfect square trinomial

#### Work Step by Step

The first and third terms of the given expression, $x^2+18x+81 ,$ are both perfect squares. The middle term is twice the product of the square root of the first term and the square root of the third term. Hence, it is $\text{ a perfect square trinomial .}$

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