Answer
$\dfrac{mn}{r^2}
$
Work Step by Step
The correct right side of the given incorrect equation, $
\dfrac{m}{r}\cdot\dfrac{n}{r}=\dfrac{mn}{r}
,$ is
\begin{array}{l}\require{cancel}
\dfrac{m(n)}{r(r)}
\\\\=
\dfrac{mn}{r^2}
.\end{array}
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter R - Review Exercises - Page 77: 122
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