Answer
The necessary caution is that subtraction could come into play.
Work Step by Step
With subtraction, you have to keep in mind the negative sign could change part of the formula.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.3 - Simplifying Radical Expressions - Vocabulary, Readiness & Video Check - Page 432: 8
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