Answer
True.
Work Step by Step
Plugging in $x=-\sqrt6$:
$3(-\sqrt6)^2=3\cdot6=18$ Thus the statement is true.
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set - Page 572: 149
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