Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 4 Quadratic Functions and Factoring - 4.6 Perform Operations with Complex Numbers - 4.6 Exercises - Mixed Review - Page 282: 89


The solutions are $-5$ and $5$.

Work Step by Step

$ 2x^{2}-8=42\qquad$ ...divide entire expression with $2$. $ x^{2}-4=21\qquad$ ...add $4$ to each side. $x^{2}-4+4=21+4$ $ x^{2}=25\qquad$ ...take square roots of each side. $ x=\pm\sqrt{25}\qquad$ ...evaluate $\sqrt{25}$ $x=\pm 5$
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