College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 7 - Section 7.3 - The Ellipse - 7.3 Assess Your Understanding - Page 525: 43

Answer

Center $ \quad (3,-1)$ Foci: $ \quad (3,-1+\sqrt{5}),\quad (3,-1-\sqrt{5})$ Vertices: $ \quad (3,2),\quad (3,-4)$

Work Step by Step

The form of the equation is $ \displaystyle \frac{(x-h)^{2}}{b^{2}}+\frac{(y-k)^{2}}{a^{2}}=1, \quad a \gt b \gt 0$. 1. $ \quad $The main axis is vertical, 2. $ \quad $Center = $(3,-1)$, 3.$ \quad a=3, b=2.$ Find $c: $ $c^{2}=a^{2}-b^{2}=9-4=5$ $c=\sqrt{5}\approx 2.236$ Vertices: $ \quad (h,k\pm a)=(3,-1\pm 3)$ $(3,2),\quad (3,-4)$ Foci: $ \quad (h,k\pm c) = (3,-1\pm\sqrt{5})$
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