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One focus is at (5,11.94). Find the other focus for the ellipse defined by this equation: (x5)^2/1 + (y+4)^2/64=1
 one year ago
 one year ago
One focus is at (5,11.94). Find the other focus for the ellipse defined by this equation: (x5)^2/1 + (y+4)^2/64=1
 one year ago
 one year ago

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telliott99Best ResponseYou've already chosen the best response.1
The ellipse is centered at 5,4 The minor axis is 2a with a = 1 The major axis is 2b with b = sqrt(64) = 8. Have to look up for the foci again.
 one year ago

GiggleSquidBest ResponseYou've already chosen the best response.0
so the major axis is 2 x 8 or is it just 8, thanks for the help btw
 one year ago

telliott99Best ResponseYou've already chosen the best response.1
The foci are at sqrt(b^2  a^2) = 7.937, have to compute the offsets based on the origin.
 one year ago

telliott99Best ResponseYou've already chosen the best response.1
I think the terminology is major axis = 2 x 8 semimajor axis = 8
 one year ago

telliott99Best ResponseYou've already chosen the best response.1
study up :) http://en.wikipedia.org/wiki/Ellipse
 one year ago

GiggleSquidBest ResponseYou've already chosen the best response.0
so how do i get the y value for the foci, the x being 7.937 right?
 one year ago

telliott99Best ResponseYou've already chosen the best response.1
Offsets: foci are at x = 5 yvalues are 4 +/ 7.937 = 11.937, 3.937
 one year ago

telliott99Best ResponseYou've already chosen the best response.1
This ellipse has its long dimension vertical.
 one year ago

GiggleSquidBest ResponseYou've already chosen the best response.0
so its 11.937,3.937?
 one year ago

telliott99Best ResponseYou've already chosen the best response.1
Those are the y's. (5,11.937) and (5,3.937)
 one year ago

telliott99Best ResponseYou've already chosen the best response.1
Maybe I didn't say that clearly. Because the ellipse is oriented vertically (y stretched more), the foci have the same xvalue, which is equal to the origin, 5. The foci are +/ sqrt(63) see above with respect to the yvalue of the origin, which is 4, so that gives what I said.
 one year ago
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