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3 March, 13:16

If f (x) = x2 + 7; Find x if f (x) = 23

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  1. 3 March, 13:45
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    x = 4, - 4

    Step-by-step explanation:

    f (x) = x^2 + 7

    f (x) = 23

    23 = x^2+7

    Subtract 7 from each side

    23-7 = x^2 + 7-7

    16 = x^2

    Take the square root of each side

    ±sqrt (16) = sqrt (x^2)

    ±4 = x
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