Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 11 - Section 11.3 - Hyperbolas - 11.3 Exercises - Page 805: 17

Answer

(a) Vertices: $V(±2,0)$ Foci: $F(±\sqrt {13},0)$, Asymptotes: $y=±\frac{3}{2}x$ (b) Length of the transverse axis: $2a=4$ (c)

Work Step by Step

$9x^2-4y^2=36$ $\frac{x^2}{4}-\frac{y^2}{9}=1$ Hyperbola with horizontal transverse axis: $\frac{x^2}{a^2}-\frac{y^2}{b^2}=1$ $a^2=4$ $a=2$ $b^2=9$ $b=3$ $c^2=a^2+b^2=4+9=13$ $c=\sqrt {13}$ (a) Vertices: $V(±a,0)=V(±2,0)$ Foci: $F(±c,0)=F(±\sqrt {13},0)$, Asymptotes: $y=±\frac{b}{a}x=±\frac{3}{2}x$ (b) Length of the transverse axis: $2a=4$
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