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9 April, 13:23

Find the x-intercepts of the parabola with vertex (1, - 9) and y intercept at (0, - 6).

(-1, 0), (3, 0)

(-0.73, 0), (2.73, 0)

(-1.48, 0), (2.48, 0)

(-4.67, 0), (1.67, 0)

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Answers (1)
  1. 9 April, 16:14
    0
    Hello,

    Equation is y=k (x-1) ²-9

    and when x=0, y=-6==>-6=k*1²-9==>k=3

    y=3 (x-1) ²-9

    when y=0, 3 (x-1) ²-9=0

    ==> (x-1-√3) (x-1+√3) = 0

    x-intercepts are (1+√3,0) and (1-√3,0)

    Answer B.
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