Answer
$3\sqrt7-21$
Work Step by Step
$3\sqrt7(1-\sqrt7)\longrightarrow$ use the distributive property
=$3\sqrt7-3(\sqrt7)(\sqrt7)\longrightarrow$ simplify
=$3\sqrt7-3(7)\longrightarrow$ multiply
=$3\sqrt7-21$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 10 - Radical Expressions and Equations - 10-3 Operations with Radial Expressions - Practice and Problem-Solving Exercises - Page 616: 23
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