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: 45

Answer

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Work Step by Step

We are given the hyperbola: $16x^2-y^2+64x-2y+67=0$ Bring the equation to the standard form: $(16x^2+64x+64)-(y^2+2y+1)-64+1+67=0$ $16(x^2+4x+4)-(y+1)^2+4=0$ $16(x+2)^2-(y+1)^2+4=0$ $(y+1)^2-16(x+2)^2=4$ $\dfrac{(y+1)^2}{4}-\dfrac{16(x+2)^2}{4}=1$ $\dfrac{(y+1)^2}{4}-\dfrac{(x+2)^2}{\dfrac{1}{4}}=1$ The standard form of the equation is: $\dfrac{(y-k)^2}{a^2}-\dfrac{(x-h)^2}{b^2}=1$ The transverse axis is parallel to the $y$-axis. Determine $h,k,a,b,c$: $h=-2$ $k=-1$ $a^2=4\Rightarrow a=\sqrt {4}=2$ $b^2=\dfrac{1}{4}\Rightarrow b=\sqrt {\dfrac{1}{4}}=\dfrac{1}{2}$ $c^2=a^2+b^2$ $c^2=4+\dfrac{1}{4}$ $c^2=\dfrac{17}{4}$ $c=\dfrac{\sqrt{17}}{2}$ Determine the centre: $(h,k)=(-2,-1)$ Determine the coordinates of the vertices: $(h,k-a)=(-2,-1-2)=(-2,-3)$ $(h,k+a)=(-2,-1+2)=(-2,1)$ Determine the coordinates of the foci: $(h,k-c)=\left(-2,-1-\dfrac{\sqrt{17}}{2}\right)$ $(h,k+c)=\left(-2,-1+\dfrac{\sqrt{17}}{2}\right)$ Determine the asymptotes: $y-k=\pm\dfrac{a}{b}(x-h)$ $y+1=\pm\dfrac{2}{\dfrac{1}{2}}(x+2)$ $y+1=\pm 4(x+2)$ Graph the hyperbola:
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