Answer
$3+\sqrt r$
Work Step by Step
Multiply $\frac{3+\sqrt r}{3+\sqrt r}$ to the expression, we have:
$\frac{9-r}{3-\sqrt r}\cdot \frac{3+\sqrt r}{3+\sqrt r}=\frac{(9-r)(3+\sqrt r)}{9-r}=3+\sqrt r$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.7 Radical Expressions - R.7 Exercises - Page 76: 106
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