Answer
3
Work Step by Step
We use the theorems in the chapter to obtain:
$6^2 = (CD)(9+CD) \\ CD^2 +9CD - 36 = 0 \\ (CD +12)(CD-3) = 0 \\ CD =3$
Note, CD cannot be negative.
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 6 - Review Exercises - Page 315: 24j
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