Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 5 - Section 5.1 - Ratios, Rates, and Proportions - Exercises - Page 228: 12a


$x=\sqrt {15}$ or $-\sqrt{15}$

Work Step by Step

$\frac{x+1}{2} = \frac{7}{x-1}$ $(x+1)(x-1) = 7\times2$ $x^{2}-1 = 14$ $x^{2}=15$ $x=\sqrt {15}$ or $-\sqrt{15}$
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