anonymous
  • anonymous
Which of the following equations describes an ellipses? a) 25x^(2)+16y^(2)-50x-96y-231=0 b) 9x^(2)+y^(2)+54x-2y+73=0 c) 16x^(2)+25y^(2)-64x-150y-111=0 d) 25x^(2)+9y^(2)-72y-81=0 e) 4y^(2)-x^(2)-32y-4y+56=0
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
*there can be more than one answer
anonymous
  • anonymous
if ab>0, the equation is an ellipse
anonymous
  • anonymous
where a is the coeff of x^2 and b the coeff of y^2

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anonymous
  • anonymous
I know it is an ellipse, but which equation describes it?
anonymous
  • anonymous
i said calculate ab for every case
anonymous
  • anonymous
and then when ab is negative..its an ellipse
anonymous
  • anonymous
so only e) is an ellipse
anonymous
  • anonymous
wouldn't e add up to a possitive though?
anonymous
  • anonymous
i didnt tell u to add..multiply a and b
anonymous
  • anonymous
or do you not go by the result of the two, but the fact that one of the factors is negative
anonymous
  • anonymous
nvm i got it. thank you.
anonymous
  • anonymous
in e) a x b is negative

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