Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter 10 - Conics, Parametric Equations, and Polar Coordinates - 10.1 Exercises - Page 692: 43

Answer

$$\frac{{{y^2}}}{9} - \frac{{{{\left( {x - 2} \right)}^2}}}{{9/4}} = 1$$

Work Step by Step

$$\eqalign{ & {\text{Vertices }}\left( {2, \pm 3} \right) \cr & {\text{Vertices }}\left( {\underbrace 2_x,\underbrace 3_y} \right){\text{ and }}\left( {\underbrace 2_x,\underbrace { - 3}_y} \right) \cr & x = x{\text{ so the hyperbola has the standard form}} \cr & \frac{{{{\left( {y - k} \right)}^2}}}{{{a^2}}} - \frac{{{{\left( {x - h} \right)}^2}}}{{{b^2}}} = 1 \cr & {\text{Characteristics of the hyperbola}} \cr & {\text{Vertices }}\left( {h,k - a} \right){\text{ and }}\left( {h,k + a} \right) \cr & {\text{Vertices }}\left( {2,\underbrace { - 3}_{k - a},} \right){\text{ and }}\left( {0,\underbrace 3_{k + a}} \right) \cr & k - a = - 3 \cr & k + a = 3 \cr & k = 0,{\text{ }}a = 3,{\text{ }}h = 2 \cr & \cr & \frac{{{{\left( {y - 0} \right)}^2}}}{{{3^2}}} - \frac{{{{\left( {x - 2} \right)}^2}}}{{{b^2}}} = 1 \cr & \frac{{{y^2}}}{{{3^2}}} - \frac{{{{\left( {x - 2} \right)}^2}}}{{{b^2}}} = 1 \cr & {\text{We know the point on the graph }}\left( {0,5} \right) \cr & \frac{{{{\left( 5 \right)}^2}}}{{{3^2}}} - \frac{{{{\left( {0 - 2} \right)}^2}}}{{{b^2}}} = 1 \cr & \frac{{25}}{9} - \frac{4}{{{b^2}}} \to {b^2} = \frac{9}{4} \cr & \cr & \underbrace {\frac{{{y^2}}}{{{3^2}}} - \frac{{{{\left( {x - 2} \right)}^2}}}{{{b^2}}} = 1}_ \Downarrow \cr & \frac{{{y^2}}}{9} - \frac{{{{\left( {x - 2} \right)}^2}}}{{9/4}} = 1 \cr} $$
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