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briana.img
 one year ago
What are the foci of the following graph?
briana.img
 one year ago
What are the foci of the following graph?

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briana.img
 one year ago
Best ResponseYou've already chosen the best response.0I started with a=1 and b=2 and so c^2=1^22^2 it ends up to be c^2=3 but i don't feel as that's right

Loser66
 one year ago
Best ResponseYou've already chosen the best response.2Look at the graph, we can see that the foci must be on the xaxis, hence, the coordinate must be under the form of (x,0) and (x,0). Therefore, we can get rid of A and D

Loser66
 one year ago
Best ResponseYou've already chosen the best response.2Now, if it is B, the point \((1+\sqrt 3,0)\) has xcoordinate >1, that is it is out of the graph > cannot be a foci. Now, we have just.......??

briana.img
 one year ago
Best ResponseYou've already chosen the best response.0@Loser66 just C left

Loser66
 one year ago
Best ResponseYou've already chosen the best response.2Yup, but does it make sense to you?

briana.img
 one year ago
Best ResponseYou've already chosen the best response.0@Loser66 yeah i'll look at this next time i'm having trouble

dan815
 one year ago
Best ResponseYou've already chosen the best response.0do you know what is special about the foci

Loser66
 one year ago
Best ResponseYou've already chosen the best response.2@dan815 Yes, I do. However, in this case, it is easier than the traditional way on finding the foci out by rejecting the wrong one.

dan815
 one year ago
Best ResponseYou've already chosen the best response.0if you draw a straight line from one foci to another foci while hitting the ellipse anywhere once, the length of the lines forces is constant, using that we can figure out where a foci is for any ellipsode with a and b, dominant and codominant axis respectively
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