Answer
$x = 2\sqrt 7$ or $-2\sqrt 7$
Work Step by Step
$\frac{x}{4} = \frac{7}{x}$
$x^{2} = 28$
$x = \sqrt {28}$ or $-\sqrt {28}$
$x = 2\sqrt 7$ or $-2\sqrt 7$
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 5 - Section 5.1 - Ratios, Rates, and Proportions - Exercises - Page 226: 9a
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