Answer
DB=4
Work Step by Step
$\frac{DB}{CM+MB}$=$\frac{MB}{AD+DB}$
$\frac{DB}{12}$=$\frac{6}{14+DB}$
DB$^2$+14DB-72=0
(DB+18)(DB-4)=0
DB=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 - Test - Page 276: 15
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