briana.img
  • briana.img
What are the foci of the following graph?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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briana.img
  • briana.img
briana.img
  • briana.img
I started with a=1 and b=2 and so c^2=1^2-2^2 it ends up to be c^2=-3 but i don't feel as that's right
Loser66
  • Loser66
Look at the graph, we can see that the foci must be on the x-axis, hence, the coordinate must be under the form of (-x,0) and (x,0). Therefore, we can get rid of A and D

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More answers

Loser66
  • Loser66
Now, if it is B, the point \((1+\sqrt 3,0)\) has x-coordinate >1, that is it is out of the graph --> cannot be a foci. Now, we have just.......??
briana.img
  • briana.img
@Loser66 just C left
Loser66
  • Loser66
Yup, but does it make sense to you?
briana.img
  • briana.img
@Loser66 yeah i'll look at this next time i'm having trouble
dan815
  • dan815
do you know what is special about the foci
Loser66
  • Loser66
@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
  • dan815
|dw:1435322594474:dw|
dan815
  • dan815
|dw:1435322627563:dw|
dan815
  • dan815
if 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
dan815
  • dan815
|dw:1435322824510:dw|
dan815
  • dan815
|dw:1435322927884:dw|
dan815
  • dan815
|dw:1435322980864:dw|
dan815
  • dan815
|dw:1435323122841:dw|
dan815
  • dan815
|dw:1435323133713:dw|

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