Answer
$x^2=80y$
Work Step by Step
Focus: $(0,20)$; Directrix: $y=-20$
$x^2=4py$ (parabola equation)
$F(0,p)$ (focus formula)
$y=-p$ (directrix formula)
$F(0,20)$
$4(20)=80$
$x^2=80y$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 7 - Conic Sections - Exercise Set 7.3 - Page 699: 22
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