Answer
$r = 0$
Work Step by Step
So first, let's subtract $49$ from both sides
$r^2 = 0$
The number $0$ is $0$ multiplied by itself.
If you square root both sides, you get
$r = 0$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 9 - Quadratic Functions and Equations - 9-3 Solving Quadratic Equations - Practice and Problem-Solving Exercises - Page 564: 23
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