SOLUTION: Ok I don't know where to start with this one some more help please? Which of the following correctly represents the coordinates of the foci of the ellipse shown below? (x+2)^2/9+(y

Algebra ->  Quadratic-relations-and-conic-sections -> SOLUTION: Ok I don't know where to start with this one some more help please? Which of the following correctly represents the coordinates of the foci of the ellipse shown below? (x+2)^2/9+(y      Log On


   



Question 1100420: Ok I don't know where to start with this one some more help please? Which of the following correctly represents the coordinates of the foci of the ellipse shown below? (x+2)^2/9+(y-4)^2/36=1
A.[-2,4+-9sqrt3]
B.[-2+-3sqrt3,4]
C.[-2,4+-3sqrt3]
D.[-2+-9sqrt3,4]

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Calculate the foci using the semi-major and semi-minor lengths.
c%5E2=b%5E2-a%5E2
c%5E2=36-9
c%5E2=27
c=3sqrt%283%29
Starting at the center (-2,4), add/subtract to the y-coordinate,
(-2,4%2B3sqrt%283%29) and (-2,4-3sqrt%283%29)
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