Answer
The answer is $3\sqrt7 -21$.
Work Step by Step
We can simplify the expression as follows:
$=3\sqrt7(1-\sqrt7)$
$=3\sqrt7 -3*\sqrt7*\sqrt7$
$=3\sqrt7 -3*7$
$=3\sqrt7 -21$.
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 10 - Radical Expressions and Equations - 10-3 Operations With Radical Expressions - Practice and Problem-Solving Exercises - Page 629: 23
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