Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 10 - Radical Expressions and Equations - 10-3 Operations With Radical Expressions - Practice and Problem-Solving Exercises - Page 629: 23


The answer is $3\sqrt7 -21$.

Work Step by Step

We can simplify the expression as follows: $=3\sqrt7(1-\sqrt7)$ $=3\sqrt7 -3*\sqrt7*\sqrt7$ $=3\sqrt7 -3*7$ $=3\sqrt7 -21$.
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