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 $-\sqrt{15}$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
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
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