Answer
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A parabola can be defined as all points on a plane with equal-distance from a fixed line (directrix) and a fixed point (focus).
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 9 - Section 9.3 - The Parabola - Exercise Set - Page 998: 77
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