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anonymous

  • 5 years ago

Find the foci for the ellipse 25x^2 + 4y^2 = 100?

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  1. anonymous
    • 5 years ago
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    Basically i need to convert it to the form \[x^2 / a^2 + y^2 / b^2 = c\]

  2. anonymous
    • 5 years ago
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    yes, so divide both sides by 100 and post what you got.

  3. anonymous
    • 5 years ago
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    I get it. So it's \[x^2 / 4 + y^2 / 25 = 1\] (: I just wasn't sure, because all three are square numbers so it looked like i had to do something with square roots...

  4. anonymous
    • 5 years ago
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    yup, so what are a,b and c?

  5. anonymous
    • 5 years ago
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    you figured it out, right?

  6. anonymous
    • 5 years ago
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    yup! All good!! (: a=2, b=5, c=1

  7. anonymous
    • 5 years ago
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    well the actual c value is root29. but my c in the equation is 1, and it has to be 1 anyway. O_o

  8. anonymous
    • 5 years ago
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    actually, a= +2 and -2 b = +5 and -5

  9. anonymous
    • 5 years ago
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    well yeah... i always ignore the +/- by accident. :P thank you!

  10. anonymous
    • 5 years ago
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    np

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