Answer
See below
Work Step by Step
Add $4$ to both sides:
$$7x^2=12\\
\rightarrow x^2=\frac{12}{7}\\
\rightarrow x= \pm \sqrt \frac{12}{7}=\pm \frac{2\sqrt 3}{7}$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 5 Polynomials and Polynomial Functions - 5.9 Write Polynomial Functions and Models - 5.9 Exercises - Mixed Review - Page 399: 42
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