Answer
See explanations.
Work Step by Step
Step 1. Identify parameters: $a=5, b=4$, center $(0,0)$, horizontal major axis.
Step 2. We have $c=\sqrt {a^2-b^2}=3$
Step 3. The foci can be located at $(\pm3, 0)$
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 9.1 - The Ellipse - Exercise Set - Page 967: 75
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