Thomas' Calculus 13th Edition

Published by Pearson
ISBN 10: 0-32187-896-5
ISBN 13: 978-0-32187-896-0

Chapter 11: Parametric Equations and Polar Coordinates - Section 11.6 - Conic Sections - Exercises 11.6 - Page 678: 24

Answer

See image:

Work Step by Step

Divide the equation with $4225$ $\displaystyle \frac{x^{2}}{25}+\frac{y^{2}}{169}=1$ $\displaystyle \frac{x^{2}}{(5)^{2}}+\frac{y^{2}}{(13)^{2}}=1$, which is of the form $\quad \displaystyle \frac{x^{2}}{b^{2}}+\frac{y^{2}}{a^{2}}=1 \quad (a\gt b)$ $\Rightarrow$ the foci are on the y-axis. Center-to-focus distance: $\quad c=\sqrt{a^{2}-b^{2}}=\sqrt{169-25}=12$ Foci: $\quad(0, \pm c)= \quad(0, \pm 12)$ Vertices: $\quad (0, \pm a)= \quad (0, \pm 13)$
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