Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

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

Answer

$x=\sqrt {15}$ 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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