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30 May, 15:48

Find the x-intercepts of the parabola with

vertex (4,-20) and y-intercept (0,-4).

Write your answer in this form: (x1,71), (X2,72).

If necessary, round to the nearest hundredth.

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Answers (1)
  1. 30 May, 16:00
    0
    (8.47,0) (-0.47,0)

    Step-by-step explanation:

    y = a (x - h) ² + k

    y = a (x - 4) ² - 20

    -4 = a (0 - 4) ² - 20

    16 = 16a

    a = 1

    y = (x - 4) ² - 20

    x-intercepts: y = 0

    (x - 4) ² = 20

    x - 4 = + / - 4.47 ...

    x = 4.47+4, - 4.47+4

    x = 8.47, - 0.47
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