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anonymous

  • one year ago

match the parabolas with their focuses Focuses: (-2.75,-10), (2,11.75), (-4, -13.875), (1.25,17)

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  1. anonymous
    • one year ago
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    not all of these will be used y=-x^2+4x+8 y=2x^2+16x+18 y=-2x^2+5x+14 y=-x^2+17x+7 y=2x^2+11x+5 y=-2x^2+6x+5

  2. Mehek14
    • one year ago
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    what did you get so far?

  3. anonymous
    • one year ago
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    nothing, I don't even know how to begin

  4. Mehek14
    • one year ago
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    use \(\dfrac{-b}{2a}\)

  5. Mehek14
    • one year ago
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    \(ax^2+bx+c\)

  6. Mehek14
    • one year ago
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    in the first equation, a = -1, b = 4

  7. Mehek14
    • one year ago
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    plug that into the formula to get the x coordinate of the focus, then plug the value of x into the equation to find y

  8. Mehek14
    • one year ago
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    what do you get for the first one?

  9. LynFran
    • one year ago
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    yea here an example for the 1st one |dw:1439146843038:dw|the rest shd be done the same...

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