Answer
$$ x^2+y^2=9$$
Work Step by Step
Since the center is at the origin, we use the distance formula to find that the radius must be:
$$\sqrt{\left(0-0\right)^2+\left(3-0\right)^2}=3$$
Thus, it follows:
$$x^2+y^2=r^2 $$
$$ x^2+y^2=9$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 9 Quadratic Relations and Conic Sections - 9.3 Graph and Write Equations of Circles - 9.3 Exercises - Quiz for Lessons 9.1-9.3 - Page 632: 7
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