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11 March, 17:19

If f (x) = x^2 - 4x + 1, find the range of f (x).

{y: y ≥ - 3}

{y: y ≥ 13}

all reals

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Answers (1)
  1. 11 March, 18:48
    0
    Hello:

    y = x² - 4x + 1

    calculate : x

    y = (x²-4x+4) - 4+1

    y+3 = (x-2) ²

    x exist : if y+3 ≥ 0

    y ≥ - 3

    the range is : {y: y ≥ - 3}
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