Answer
DC=3
Work Step by Step
$\frac{BD+DC}{AC}$=$\frac{AC}{DC}$
3DC+DC$^2$=18
DC$^2$+3DC-18=0
(DC+6)(DC-3)=0
DC=3
Elementary Geometry for College Students (6th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
9781285195698
ISBN 13:
978-1-28519-569-8
Chapter 5 - Review Exercises - Page 263: 30d
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