Answer
focus, directrix
Work Step by Step
A parabola is the set of all points in the plane equidistant from a fixed point (the focus) and a fixed line (directrix).
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 554: 1
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