anonymous
  • anonymous
Which of the following correctly represents the coordinates of the foci of the ellipse attached?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
anonymous
  • anonymous
answer choices A,B,C,D from top to bottom :) ***idk :( please explain! THanks :D
Hero
  • Hero
There's a great tutorial on this at purplemath.com

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anonymous
  • anonymous
could you please explain this to me? :)
Hero
  • Hero
I'm not very good at explaining things.
anonymous
  • anonymous
so im not quite sure... but I'm thinking B or D right? :/
anonymous
  • anonymous
aww :( okay :/ but is it B or D? thats what i have simplified it down to so far...
Hero
  • Hero
You sound like you're guessing.
anonymous
  • 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
  • anonymous
does that look right to you so far??
Hero
  • Hero
I thought that was a minus, it's a plus, so yes, it will be either B or D.
anonymous
  • anonymous
kk :) so what i did so far is right? :D
Hero
  • Hero
At first, I thought it was \[\frac{(x+2)^2}{9} - \frac{(y-4)^2}{36} = 1\]
anonymous
  • 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
  • anonymous
ohhh hhaa yeah its + :)
Hero
  • Hero
I looked at it wrong
anonymous
  • anonymous
haha yeah its all good =D
Hero
  • 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
  • Hero
I didn't use calculators either. I couldn't afford one when I was in HS.
anonymous
  • anonymous
oh yeah i just don't know what to do after that.. :(
anonymous
  • anonymous
can you please show me what to do from there?? idk what to do :(
Hero
  • Hero
I told you to review the tutorial on purplemath.com
anonymous
  • anonymous
i don't know where to find it though .... :( can u pls show me what to do from here?? :)
anonymous
  • 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
  • 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
  • anonymous
okay... well i didn't know this one :( could u pls tell me if i got it right?? =)
anonymous
  • anonymous
but the tutorial helped a bit... did i get it?? is it B? :O
Hero
  • Hero
I'm not going to answer that question.
anonymous
  • anonymous
okay :) thanks for your help though @Hero!! :) It's much appreciated :)

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