Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 10 - Section 10.4 - Adding, Subtracting, and Multiplying Radical Expressions - Practice - Page 708: 13



Work Step by Step

Step 1: The formula to be used here is, $(a+b)(a-b)= a^{2}-b^{2}$, Step 2: Applying the formula to the expression in the question , $(\sqrt (5y) +2)(\sqrt (5y)-2)$ = $(\sqrt (5y))^{2}- (2)^{2}$ Step 3: Simplifying, $(\sqrt (5y))^{2}- (2)^{2}$= $5y-4$
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