Answer
$n = ±9$
Work Step by Step
The number $81$ is $9$ multiplied by itself, or $-9$ multiplied by itself.
If you square root both sides, you get
$n = ±9$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 9 - Quadratic Functions and Equations - 9-3 Solving Quadratic Equations - Practice and Problem-Solving Exercises - Page 564: 20
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