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anonymous
 5 years ago
Find the foci for the ellipse 25x^2 + 4y^2 = 100?
anonymous
 5 years ago
Find the foci for the ellipse 25x^2 + 4y^2 = 100?

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Basically i need to convert it to the form \[x^2 / a^2 + y^2 / b^2 = c\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yes, so divide both sides by 100 and post what you got.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I 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...

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yup, so what are a,b and c?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you figured it out, right?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0yup! All good!! (: a=2, b=5, c=1

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0well the actual c value is root29. but my c in the equation is 1, and it has to be 1 anyway. O_o

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0actually, a= +2 and 2 b = +5 and 5

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0well yeah... i always ignore the +/ by accident. :P thank you!
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