Which of the following correctly represents the coordinates of the foci of the ellipse attached?

- anonymous

Which of the following correctly represents the coordinates of the foci of the ellipse attached?

- katieb

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- anonymous

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- anonymous

answer choices A,B,C,D from top to bottom :)
***idk :( please explain! THanks :D

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- Hero

There's a great tutorial on this at purplemath.com

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- anonymous

could you please explain this to me? :)

- Hero

I'm not very good at explaining things.

- anonymous

so im not quite sure... but I'm thinking B or D right? :/

- anonymous

aww :( okay :/
but is it B or D? thats what i have simplified it down to so far...

- Hero

You sound like you're guessing.

- anonymous

no I'm not cuz i remember a little bit... i got this:
The denominator to y is 36, which is > than denominator of x which is 9... so its vertical right?? so you list the y first?? like this?? (y-4)^2/36 + (x+2)^2/9=1...
idk am i on the right track so far??

- anonymous

does that look right to you so far??

- Hero

I thought that was a minus, it's a plus, so yes, it will be either B or D.

- anonymous

kk :) so what i did so far is right? :D

- Hero

At first, I thought it was
\[\frac{(x+2)^2}{9} - \frac{(y-4)^2}{36} = 1\]

- anonymous

and the center is (-2, 4) right?? which leads me to either B or D... but idk how to find that last part :(

- anonymous

ohhh hhaa yeah its + :)

- Hero

I looked at it wrong

- anonymous

haha yeah its all good =D

- Hero

If you made it this far, you should be able to figure out which one it is between the two. I told you that you need to be more confident in your work rather than ask for confirmation every time you worked out a problem. When I was your age, I never asked for confirmation. I was always confident in my work.

- Hero

I didn't use calculators either. I couldn't afford one when I was in HS.

- anonymous

oh yeah i just don't know what to do after that.. :(

- anonymous

can you please show me what to do from there?? idk what to do :(

- Hero

I told you to review the tutorial on purplemath.com

- anonymous

i don't know where to find it though .... :( can u pls show me what to do from here?? :)

- anonymous

k so i found this link... http://www.purplemath.com/modules/ellipse2.htm
is that it?? I'm reading on it and from that i think the answer is B.... is that it?? am i understanding that link correctly?? is it B?? :D @hero? :)

- Hero

As I stated before, you should be more confident in your own work. I believe you're smart enough to understand this without having to constant beg me for confirmation.

- anonymous

okay... well i didn't know this one :( could u pls tell me if i got it right?? =)

- anonymous

but the tutorial helped a bit... did i get it?? is it B? :O

- Hero

I'm not going to answer that question.

- anonymous

okay :) thanks for your help though @Hero!! :) It's much appreciated :)

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