Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 10 - Section 10.5 - Conic Sections - 10.5 Exercises - Page 680: 20

Answer

Vertices: $(-6,0)$ and $(6,0)$ Foci: $(-10,0)$ and $(10,0)$ Asymptotes: $y = \pm \frac{4}{3} x$

Work Step by Step

The following is a horizontal hyperbola because the $x^{2}$ term is first, a vertical hyperbola has the $y^{2}$ term first. $\frac{x^{2}}{36}-\frac{y^{2}}{64}=1$ General equation of a horizontal hyperbola: $\frac{x^{2}}{a^{2}}-\frac{y^{2}}{b^{2}}=1$ where $a$ is the distance from the center to the vertices. $a^{2} = 36,$ so $a = 6$, and because the hyperbola is centered at the origin, then the vertices are $(-6,0)$ and $(6,0)$ The distance from the center to the foci is equal to $c$ where $c^{2} = a^{2} +b^{2}$ Plugging in values, we get $c^{2} = 36 +64$ and $c = 10$ Thus, the foci are $(-10,0)$ and $(10,0)$. The slope of the asymptotes passing through the center of the hyperbola is $\pm \frac{b}{a}$ Plugging in values, we get $m = \frac{8}{6}$ which simplifies to $m = \frac{4}{3}$ so the equations of the asymptotes are $y = \pm \frac{4}{3} x$
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