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: 90


The solutions are $-6$ and $6$.

Work Step by Step

$ 3x^{2}+13=121\qquad$ ...add $-13$ to each side. $3x^{2}+13-13=121-13$ $ 3x^{2}=108\qquad$ ...divide both sides with $3$. $ x^{2}=36\qquad$ ...take square roots of each side. $ x=\pm\sqrt{36}\qquad$ ...evaluate $\sqrt{36}$ $x=\pm 6$
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