Answer
AD=4
Work Step by Step
$\frac{AD+DC}{AB}$=$\frac{AB}{AD}$
$\frac{AD+2}{2\sqrt 6}$=$\frac{2\sqrt 6}{AD}$
AD$^2$+2AD-24=0
(AD+6)(AD-4)=0
AD=4
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 - Review Exercises - Page 274: 31d
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