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20 November, 06:13

Write y=-3x^2+12x-21 in vertex form

A) y=-3 (x-2) ^2-9

B) y=-3 (x+2) ^2-9

C) y=-3 (x+2) ^2+9

D) y=-3 (x-2) ^2+9

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Answers (2)
  1. 20 November, 07:56
    0
    Complete the square:

    y = 3x^2 - 12x + 4

    y = 3 (x^2 - 4x) + 4

    y = 3 (x^2 - 4x + 4 - 4) + 4

    y = 3 (x^2 - 4x + 4) - 12 + 4

    y = 3 (x - 2) ^2 - 8
  2. 20 November, 08:09
    0
    The vertex form of any function is : f (x) = a (x-h) ^2 + k

    Hence the correct option would be: A) : " - 3 (x-2) ^2-9"
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