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anonymous

  • 5 years ago

write the equation of the parabola with focus (1, -3) and vertex (5, -3)??

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  1. amistre64
    • 5 years ago
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    it opens to the left

  2. amistre64
    • 5 years ago
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    the a value = 4 y^2 =16x modify for off centered

  3. anonymous
    • 5 years ago
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    alright thanks, but how did you know that

  4. amistre64
    • 5 years ago
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    opps; opens left

  5. amistre64
    • 5 years ago
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    the line between the vertex and foci is straight along the y = -3 axis

  6. amistre64
    • 5 years ago
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    the vertex is the bend and the focus is inside the curve

  7. amistre64
    • 5 years ago
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    the distance from the vertex to the focus is the "a" value in the parabola formula from geometery

  8. amistre64
    • 5 years ago
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    y^2 = -4ax

  9. anonymous
    • 5 years ago
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    is that the directrix?

  10. amistre64
    • 5 years ago
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    the directix is on the other side of the vertex; the distance 'a'

  11. amistre64
    • 5 years ago
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    the directix would be at x=9

  12. anonymous
    • 5 years ago
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    ok

  13. anonymous
    • 5 years ago
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    thank you

  14. amistre64
    • 5 years ago
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    youre welcome :) the complete answer is: (y+3)^2 = -16(x-5)

  15. anonymous
    • 5 years ago
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    lol thanks again :)

  16. anonymous
    • 5 years ago
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    do you know what the latus rectum of a ellipse is?

  17. amistre64
    • 5 years ago
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    sounds painful; .... i prolly do, but just dont know the proper term for it :)

  18. anonymous
    • 5 years ago
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    haha i was out of school and i come back i was like wtf???

  19. amistre64
    • 5 years ago
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    it is defined as the chord running thru the focus

  20. anonymous
    • 5 years ago
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    mhmm

  21. anonymous
    • 5 years ago
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    amistre64 come back to mine please

  22. amistre64
    • 5 years ago
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    (y+3)^2 = -16(x-5) plug in x = 1 -16(-4) = y^2 + 9 + 6y = -64 y^2 +6x +73 = 0

  23. amistre64
    • 5 years ago
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    6x shoulda been 6y

  24. amistre64
    • 5 years ago
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    the latus rectum is the line thru the foci and those y values

  25. anonymous
    • 5 years ago
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    but thats a parabola right? the ellipse's equation is (x-3)^2/16 + (y+6)^2/4 = 1

  26. amistre64
    • 5 years ago
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    i forgot how to multiply lol

  27. amistre64
    • 5 years ago
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    same concept; its the line thru the focus that runs perp to the center line

  28. anonymous
    • 5 years ago
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    oh ok well, thank you

  29. amistre64
    • 5 years ago
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    we got about a min b4 they shut the site down for maintainence

  30. anonymous
    • 5 years ago
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    dang

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