Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Chapter 1 - Tools of Geometry - 1-7 Midpoint and Distance in the Coordinate Plane - Lesson Check: 5

Answer

He did not keep the x and y values together.

Work Step by Step

The distance formula is: $\sqrt {(x_{2}-x_{1})^{2}+ (y_{2}-y_{1})^{2}}$ As the coordinates are (1,5) and (3,8), the distance formula should have looked like this: $\sqrt {(3-1)^{2}+ (8-5)^{2}}$ As can be seen, this person did not put their x and y values in the correct spot.
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