Answer
$\frac{21}{a^{2}}$ is true.
$\frac{21}{a}$ is false.
Work Step by Step
$\frac{7}{a}$ * $\frac{3}{a}$=$\frac{7*3}{a*a}$=
$\frac{21}{a^{2}}$ is true.
$\frac{21}{a}$ is false.
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 7 - Section 7.2 - Multiplying and Dividing Rational Expressions - Exercise Set - Page 501: 72
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