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anonymous

  • one year ago

Write the equation of a parabola with a vertex at (-3, 7) and a directrix x = -8

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  1. dan815
    • one year ago
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    |dw:1436317762129:dw|

  2. dan815
    • one year ago
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    do you know what is special about the directrix

  3. anonymous
    • one year ago
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    it's parallel to whichever is squared

  4. dan815
    • one year ago
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    @taramgrant0543664

  5. dan815
    • one year ago
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    i have to go for a bit, she might help you

  6. dan815
    • one year ago
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    this will get you started, the main this is that the length from the focus to the parabola and the perpendicular length from the directrix to the parabola is the same

  7. dan815
    • one year ago
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    |dw:1436318152545:dw|

  8. dan815
    • one year ago
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    |dw:1436318196480:dw|

  9. dan815
    • one year ago
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    not drawn to scale but that relationship is always true

  10. dan815
    • one year ago
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    from the focus to the parabola is the same distance as the perpendicular distance from the directrix to a point on the parabola

  11. dan815
    • one year ago
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    see if you can think of idea to solve for your parabola equation y=ax^2+bx+c

  12. anonymous
    • one year ago
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    x+3=1/20(y-2)^2

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