Answer
$x=-4,4$
Work Step by Step
$3x^{2}-1=47$
$3x^{2}=48$
$x^{2}=16$
$x=-4,4$
Isolate $x$ on one side by combining the other term with the other side. Then divide both sides, and then take the square root of both sides to get two answers.
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 1 - Equations and Inequalities - Exercise Set 1.5 - Page 160: 18
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