Precalculus (6th Edition) Blitzer

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

Chapter 9 - Section 9.3 - The Parabola - Concept and Vocabulary Check - Page 996: 8

Answer

$y=-2$.

Work Step by Step

Given $4p=4$, we have $p=1$. With the vertex at $(-2,-1)$, we can identify its directrix as $y=-2$.
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