Answer
x=3
Work Step by Step
By the definition of midpoint,
$AD\cong DB$
Substitute the given values.
$x+8=2x+5$
Subtract x from each side and simplify.
$x+8-x=2x+5-x$
$8=x+5$
Subtract 5 from each side and simplify.
$8-5=x+5-5$
$3=x$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 2 - Reasoning and Proof - Get Ready! - Page 79: 13
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