Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 10 - Analytic Geometry - 10.3 Hyperbolas - 10.3 Exercises - Page 988: 46

Answer

$$\frac{{{{\left( {y + 7} \right)}^2}}}{{36}} - \frac{{{{\left( {x - 9} \right)}^2}}}{{64}} = 1$$

Work Step by Step

$$\eqalign{ & {\text{center at }}\left( {9, - 7} \right);{\text{ focus at }}\left( {9, - 17} \right);{\text{ vertex at }}\left( {9, - 13} \right) \cr & {\text{The }}x{\text{ - coordinate in the vertex and focus are the same, then }} \cr & {\text{the hyperbola has the equation }}\frac{{{{\left( {y - k} \right)}^2}}}{{{a^2}}} - \frac{{{{\left( {x - h} \right)}^2}}}{{{b^2}}} = 1 \cr & {\text{With center at }}\left( {h,k} \right) \cr & {\text{center at }}\left( {9, - 7} \right) \to h = 9,\,\,k = - 7 \cr & {\text{vertices at }}\left( {h,k \pm a} \right){\text{,}}\,{\text{ vertex at }}\left( {9, - 13} \right) \cr & k - a = - 13 \cr & - 7 - a = - 13 \cr & a = 6 \cr & \cr & {\text{foci at }}\left( {h,k \pm c} \right),{\text{focus at }}\left( {9, - 17} \right) \cr & k - c = - 17 \cr & - 7 - c = - 17 \cr & c = 10 \cr & {b^2} = {c^2} - {a^2} \cr & {b^2} = 100 - 36 = 64 \cr & \cr & {\text{The equation of the hyperbola is}} \cr & \frac{{{{\left( {y + 7} \right)}^2}}}{{36}} - \frac{{{{\left( {x - 9} \right)}^2}}}{{64}} = 1 \cr} $$
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