Answer
AC=35
DE=17.5
Work Step by Step
AC=DF
x+28=x$^2$-2x
x$^2$-3x+28=0
(x-7)(x+4)=0
x=7
AC=7+28
AC=35
DE=.5AC
DE=.5(35)
DE=17.5
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 6 - Review Exercises - Page 307: 26
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