Answer
See below
Work Step by Step
Given $$y^2=18x$$
Find $4px=18x\\p=4.5$
Thus, the directrix is $x=-4.5$, and the focus is at $(4.5,0)$.
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 - 9.5 Graph and Write Equations of Hyperbolas - 9.5 Exercises - Skill Practice - Page 646: 28
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