Answer
$a=2$
$b=3$
$x$-axis
Work Step by Step
For the hyperbola $\dfrac{x^2}{4}-\dfrac{y^2}{9}=1$, the value of $a$ is $\sqrt{4}=2$; the value of $b$ is $\sqrt 9=3$; and the transverse axis is the $x$-axis.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 10 - Analytic Geometry - 10.4 The Hyperbola - 10.4 Assess Your Understanding - Page 669: 13
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