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anonymous

  • 5 years ago

Find the standard form of the equation of the ellipse with the following characteristics. Foci: (+-3,0) Major Axis of Length: 18

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  1. anonymous
    • 5 years ago
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    http://tutorial.math.lamar.edu/Classes/Alg/Ellipses.aspx

  2. amistre64
    • 5 years ago
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    since the foci are along the x axis; we get: x^2 y^2 --- + --- = 1 ; so far :) r^2 r^2

  3. amistre64
    • 5 years ago
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    i should rewrite that like this: x^2 y^2 --- + --- = 1 a^2 b^2

  4. amistre64
    • 5 years ago
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    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

  5. amistre64
    • 5 years ago
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    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

  6. anonymous
    • 5 years ago
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    oh ok I see how you got that! Except it would be 72 not 73. Thanks

  7. anonymous
    • 5 years ago
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    I was close the first time I tried it.

  8. amistre64
    • 5 years ago
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    lol.....3^2 doesnt = 8? since when?

  9. anonymous
    • 5 years ago
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    lol it's al good I got the idea lol

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