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 679: 66

Answer

Center: $(-2,-3)$ Foci: $(-2\pm \sqrt 2, -3)$ Vertices: $(-1, -3)$ and $(-3,-3)$ Asymptote: $y=x-1 $ and $y=-x-5$

Work Step by Step

$x^2 - y^2 +4x -6y=6$ $(x^2 +4x + \textbf{4}) -(y^2 +6y+\textbf{9})=6 \textbf {+4 - 9}$ $(x+2)^2 - (y+3)^2 = 1$ Hyperbola form: $\frac{(x+2)^2}{1^2} - \frac{(y+3)^2}{1^2} =1$ $\qquad \qquad \qquad \qquad \quad \enspace h=-2, k=-3, a=1, b=1$ Linear eccentricity (focal distance): $c=\sqrt {a^2 +b^2}$ $\qquad \qquad \qquad \qquad \qquad \qquad \quad c=\sqrt {1^2 +1^2}$ $\qquad \qquad \qquad \qquad \qquad \qquad \quad c=\sqrt {2}$ Center: $(h,k)$ $\qquad \quad (-2,-3)$ Foci: $(h \pm c, k)$ $\qquad (-2\pm \sqrt 2, -3)$ Vertices: $(h \pm a, k)$ $\qquad \quad \enspace (-2 \pm 1, -3)$ $\qquad \quad \enspace (-1, -3)$ and $(-3,-3)$ Asymptote: $y=\pm\frac{b}{a} (x-h)+k$ $\qquad \qquad \enspace y=\pm \frac{1}{1} (x+2) -3 $ $\qquad \qquad \enspace y=x-1 $ and $y=-x-5$
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