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anonymous

  • one year ago

Find the standard form of the equation of the parabola with a focus at (0, -2) and a directrix at y = 2. https://i.gyazo.com/3a74217c9b4bc16836574bddf8afe2c0.png

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  1. welshfella
    • one year ago
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    the curve passes through the origin and as the focus is negative it opens downwards standard form of this type is x^2 = 4ay where a = focus so can you work it out?

  2. anonymous
    • one year ago
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    ok give me sec

  3. anonymous
    • one year ago
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    am i plugging in -2?

  4. welshfella
    • one year ago
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    yes I should have said a = y-coordinate of the focus

  5. anonymous
    • one year ago
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    ok

  6. anonymous
    • one year ago
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    x^2 = 4(-2)y x^2 = -8y

  7. welshfella
    • one year ago
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    ok so far the standard form is y =

  8. welshfella
    • one year ago
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    so divide both sides by -8

  9. anonymous
    • one year ago
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    y = (x^2)/-8

  10. welshfella
    • one year ago
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    yea thats ok but its usually written as |dw:1439835011279:dw|

  11. anonymous
    • one year ago
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    but thats none of the answer choices

  12. welshfella
    • one year ago
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    what are the answer choices

  13. anonymous
    • one year ago
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    its the link in the question

  14. anonymous
    • one year ago
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    oh wait i was looing at the wrong question. yea youre right

  15. welshfella
    • one year ago
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    its choice C

  16. anonymous
    • one year ago
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    *Looking

  17. anonymous
    • one year ago
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    yea i know now lol. thanks

  18. welshfella
    • one year ago
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    yw

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