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Babynini

  • one year ago

Parabolas and equations

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  1. Babynini
    • one year ago
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  2. Babynini
    • one year ago
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    @rvc

  3. Babynini
    • one year ago
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    @ganeshie8

  4. ganeshie8
    • one year ago
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    First of all notice that the parabola with a directrix equation x = -1/3 opens to the right : |dw:1433218519063:dw|

  5. Babynini
    • one year ago
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    It's not the x line that is moving up and down, but rather y moving?

  6. ganeshie8
    • one year ago
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    the general form of equation of parabola that opens to right is \[\large x = \frac{1}{4c}y^2\] where \(c = \) distance between directrix and vertex

  7. ganeshie8
    • one year ago
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    |dw:1433218643337:dw|

  8. ganeshie8
    • one year ago
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    so the equation would be \[\large x = \frac{1}{4*\frac{1}{3}}y^2\] simplify

  9. Babynini
    • one year ago
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    0.75y^2

  10. Babynini
    • one year ago
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    or 3/4y^2

  11. ganeshie8
    • one year ago
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    x = 3/4 y^2

  12. ganeshie8
    • one year ago
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    it is an equation, so you need to write the left hand side also ok

  13. ganeshie8
    • one year ago
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    the equation of parabola in question is \[x = \frac{3}{4}y^2\]

  14. Babynini
    • one year ago
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    Yep :) thank you so much!! I had been accidentally writing it like |dw:1433218892849:dw| so that's why it was all wack

  15. ganeshie8
    • one year ago
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    i see.. remember x = k is a "vertical line"

  16. Babynini
    • one year ago
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    I shall from now on ^-^ hah

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