Intermediate Algebra (12th Edition)

Published by Pearson
ISBN 10: 0321969359
ISBN 13: 978-0-32196-935-4

Chapter R - Section R.4 - Properties of Real Numbers - R.4 Exercises - Page 37: 17

Answer

-2r

Work Step by Step

The distributive property holds that $a(b+c)=ab+ac$ (for real numbers $a$, $b$, and $c$). Therefore, $7r-9r=7r+(-9r)=[7+(-9)]r=-2r$. In this case, we have used the distributive property in reverse to write the given subtraction as a product.
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