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OpenStudy (firejay5):
How to calculate the Foci w/ the following equation: in comment box
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OpenStudy (firejay5):
\[\frac{ y^2 }{ 100 } + \frac{ x^2 }{ 81 }\]
OpenStudy (firejay5):
I got foci: (0, +/- sqrt 19) c^2 = 100 - 81 c = +/- sqrt 19
OpenStudy (anonymous):
right
OpenStudy (firejay5):
that's correct
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