Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 11 - Review - Exercises - Page 834: 60

Answer

$\frac{(x-2)^2}{4}-\frac{(y-4)^2}{5}=1$

Work Step by Step

Step 1. Identify the given quantities: hyperbola center $C(2,4)$, foci $F_1(2,1)$ and $F_2(2,7)$, vertices $V_1(2,6)$ and $V_2(2,2)$. Step 2. As both the foci and vertices are horizontal, we can assume the hyperbola as $\frac{(x-h)^2}{a^2}-\frac{(y-k)^2}{b^2}=1$ Step 3. With the center at $(2,4)$, we have $h=2, k=4$ Step 4. The distance between the foci is $2c=7-1=6$, thus $c=3$ Step 5. The distance between the vertices is $2a=6-2=4$, thus $a=2$ Step 6. Use the relation $b^2=c^2-a^2=9-4=5$, we have $b=\sqrt 5$ Step 7. Conclusion: the equation for the hyperbola is $\frac{(x-2)^2}{4}-\frac{(y-4)^2}{5}=1$
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