Answer
$y^2=-8x$
Work Step by Step
If the parabola has its vertex at $(0,0)$ and its focus at $(p,0)$ then the equation is: $y^2=4px$.
Hence here $p=-2$, thus the equation is: $y^2=-8x$
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: 8
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