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: 21

Answer

Vertices: $(\pm 10,0)$ Foci: $(\pm 10\sqrt 2, 0)$ Asymptotes: $y = \pm x$

Work Step by Step

First, divide both sides by 100 to get the equation in standard form. So we have, $\frac{x^{2}}{100}-\frac{y^{2}}{100}=1$ 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. $a^{2} = 100,$ so $a = 10$, and because the hyperbola is centered at the origin, then the verticles are $(-10,0)$ and $(10,0)$ The distance from the center to the foci is equal to $c$ where $c^{2} = a^{2} +b^{2}$ Plugging in values, we get $c^{2} = 100 + 100$ and $c = \sqrt 200$ which simplifies to $10\sqrt 2$ Thus, the foci are $(-10\sqrt 2,0)$ and $(10\sqrt 2,0)$. The slope of the asymptotes passing through the center of the hyperbola is $\pm \frac{b}{a}$ Plugging in values, we get $m = \frac{10}{10}$ which simplifies to $m = 1$ so the equations of the asymptotes are $y = \pm x$
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