Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 9 - Review Exercises - Page 1035: 28


See figure: vertex $(0,0)$, focus $(0,-4)$, and directrix $y=4$

Work Step by Step

Step 1. Rewrite the equation as $x^2=-16y$; we can find $p=\frac{-16}{4}=-4$ with the parabola opening downwards as shown in the figure. Step 2. We can identify the vertex at $(0,0)$, focus at $(0,-4)$, and directrix as $y=4$
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