Answer
$4$
Work Step by Step
Given $a=3, c=5$, use the formula for $b$, we have
$b=\sqrt {c^2-a^2}=\sqrt {25-9}=4$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 9 - Analytic Geometry - Section 9.4 The Hyperbola - 9.4 Assess Your Understanding - Page 689: 12
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