College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 7 - Conic Sections - Exercise Set 7.2 - Page 686: 39

Answer

See graph

Work Step by Step

We are given the hyperbola: $(x-3)^2-4(y+3)^2=4$ Bring the equation to the standard form: $\dfrac{(x-h)^2}{a^2}-\dfrac{(y-k)^2}{b^2}=1$ $\dfrac{(x-3)^2}{4}-\dfrac{4(y+3)^2}{4}=1$ $\dfrac{(x-3)^2}{4}-\dfrac{(y+3)^2}{1}=1$ The transverse axis is parallel to the $x$-axis. Determine $h,k,a,b,c$: $h=3$ $k=-3$ $a^2=4\Rightarrow a=\sqrt 4=2$ $b^2=1\Rightarrow b=\sqrt 1=1$ $c^2=a^2+b^2$ $c^2=4+1$ $c^2=5$ $c=\sqrt 5$ The centre of the hyperbola is: $(h,k)=(3,-3)$ Determine the coordinates of the vertices: $(h-a,k)=(3-2,-3)=(1,-3)$ $(h+a,k)=(3+2,-3)=(5,-3)$ Determine the coordinates of the foci: $(h-c,k)=(3-\sqrt{5},-3)$ $(h+c,k)=(3+\sqrt{5},-3)$ Determine the asymptotes: $y-k=\pm\dfrac{b}{a}(x-h)$ $y+3=\pm\dfrac{1}{2}(x-3)$ Graph the hyperbola:
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