anonymous
  • anonymous
Find the standard form of the equation of the ellipse with the following characteristics. Foci: (+-3,0) Major Axis of Length: 18
Mathematics
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
http://tutorial.math.lamar.edu/Classes/Alg/Ellipses.aspx
amistre64
  • amistre64
since the foci are along the x axis; we get: x^2 y^2 --- + --- = 1 ; so far :) r^2 r^2
amistre64
  • amistre64
i should rewrite that like this: x^2 y^2 --- + --- = 1 a^2 b^2

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amistre64
  • amistre64
a^2 - b^2 = c^2 ; where c = the distance from the center a foci; and a = the distance from the center to a vertex...in this case its 9 i believe
amistre64
  • amistre64
9^2 - 3^2 = b^2 81 - 8 = b^2 73 = b^2 81 = a^2 x^2 y^2 --- + --- = 1 i believe is the form 81 73
anonymous
  • anonymous
oh ok I see how you got that! Except it would be 72 not 73. Thanks
anonymous
  • anonymous
I was close the first time I tried it.
amistre64
  • amistre64
lol.....3^2 doesnt = 8? since when?
anonymous
  • anonymous
lol it's al good I got the idea lol

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