Answer
$x=-7$ is extraneous
Work Step by Step
$x=\sqrt 28-3x$
With $x=4$
then $4=\sqrt 28-3(4)$
$4=4$
With $x=-7$
then $-7=\sqrt 28-3(-7)$
$-7\ne7$
Hence, $x=-7$ is extraneous.
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 - 10-4 Solving Radical Equations - Practice and Problem-Solving Exercises - Page 637: 29
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