Answer
$x^2=-12y$
Work Step by Step
Focus: $F(0,-3)$
In a parabola with vertical axis:
Focus: $F(0,p)$
So, $p=-3$
Equation of a parabola with vertical axis: $x^2=4py$
$x^2=4(-3)y$
$x^2=-12y$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 7, Conic Sections - Section 7.1 - Parabolas - 7.1 Exercises - Page 555: 52
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