Answer
We want a length, so we want the positive square root.
Work Step by Step
When we take the square root of a number, we end up with a positive number and a negative number. Lengths cannot be negative, so we want the positive square root.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.6 - Radical Equations and Problem Solving - Vocabulary, Readiness & Video Check - Page 453: 7
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