Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 9 Quadratic Relations and Conic Sections - 9.4 Graph and Write Equations of Ellipses - 9.4 Exercises - Skill Practice - Page 637: 5

Answer

Vertices: $(0,\pm 7)$ Co-vertices: $(\pm 3,0)$ Foci: $(0,\pm 2\sqrt{10})$

Work Step by Step

It is given $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$ where $a^2=9$ (or $a=3$) and $b^2=49$ (or $b=7$). Since $b=7$ is greater than $a=3$, the major axis is vertical and so $c=\sqrt{b^2-a^2}=\sqrt{7^2-3^2}=\sqrt{40}=2\sqrt{10}$. Then, the ellipse has the vertices at $(0,\pm 7)$, the co-vertices at $(\pm 3,0)$, and the foci at $(0,\pm 2\sqrt{10})$. The following is the graph of the ellipse.
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