anonymous
  • anonymous
Find the foci for the ellipse 25x^2 + 4y^2 = 100?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
Basically i need to convert it to the form \[x^2 / a^2 + y^2 / b^2 = c\]
anonymous
  • anonymous
yes, so divide both sides by 100 and post what you got.
anonymous
  • anonymous
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...

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anonymous
  • anonymous
yup, so what are a,b and c?
anonymous
  • anonymous
you figured it out, right?
anonymous
  • anonymous
yup! All good!! (: a=2, b=5, c=1
anonymous
  • anonymous
well the actual c value is root29. but my c in the equation is 1, and it has to be 1 anyway. O_o
anonymous
  • anonymous
actually, a= +2 and -2 b = +5 and -5
anonymous
  • anonymous
well yeah... i always ignore the +/- by accident. :P thank you!
anonymous
  • anonymous
np

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