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anonymous

  • 5 years ago

Find the foci of the ellipse 25x^(2)+16y^(2)-50x-96y-231=0 a) (1,7) and (1,-1) b) (1,6) and (1,0) c) (3,3) and (-1,3) d) (-2,3) and (4,3)

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  1. anonymous
    • 5 years ago
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    (0.3) and (0,-3)

  2. anonymous
    • 5 years ago
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    thats not an answer

  3. anonymous
    • 5 years ago
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    c)

  4. anonymous
    • 5 years ago
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    b

  5. anonymous
    • 5 years ago
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    why c and why b?

  6. anonymous
    • 5 years ago
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    its a vertical ellipse so x-coordinate of focii will be same

  7. anonymous
    • 5 years ago
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    so its b)

  8. anonymous
    • 5 years ago
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    why not a? both x-intercepts are 1

  9. anonymous
    • 5 years ago
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    ya for that you have to do the math

  10. anonymous
    • 5 years ago
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    my bad, saubhik is right.

  11. anonymous
    • 5 years ago
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    factorize, to (x-1)^2/16 +(y-3)^2/25 =1

  12. anonymous
    • 5 years ago
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    and then you know how to find focus with transformation of coordinates

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spraguer (Moderator)
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