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OpenStudy (anonymous):
Determine the center, vertices, and foci for the following ellipse. 32x^2 + 9y^2 - 128x + 72y = 16 center (2, -4) vertices:(2, - 4 + 4sqrt2)(2, - 4 - 4sqrt 2) foci (2, -4 + sqrt23) (2, - 4 - sqrt23)
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OpenStudy (anonymous):
complete the square time...
OpenStudy (anonymous):
ready?
OpenStudy (anonymous):
I knew how to do this I just forgot, been a couple of months, need a refresher.
OpenStudy (anonymous):
ok... group all the x and y together like this and factor out the quadratic coefficients:
OpenStudy (anonymous):
|dw:1337756834813:dw|
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