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: 19

Answer

(a) Vertices: $V(0,±6)$ Foci: $F(0,±2\sqrt {13})$, Asymptotes: $y=±\frac{3}{2}x$ (b) Length of the transverse axis: $2a=12$ (c)

Work Step by Step

$4y^2-9x^2=144$ $\frac{y^2}{36}-\frac{x^2}{16}=1$ Hyperbola with vertical transverse axis: $\frac{y^2}{a^2}-\frac{x^2}{b^2}=1$ $a^2=36$ $a=6$ $b^2=16$ $b=4$ $c^2=a^2+b^2=36+16=52$ $c=2\sqrt {13}$ (a) Vertices: $V(0,±a)=V(0,±6)$ Foci: $F(0,±c)=F(0,±2\sqrt {13})$, Asymptotes: $y=±\frac{a}{b}x=±\frac{6}{4}x=±\frac{3}{2}x$ (b) Length of the transverse axis: $2a=12$
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