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18 August, 07:27

Let f (x) = 2x - 6. solve f-1 (x) when x = 2.

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  1. 18 August, 08:08
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    F (x) = 2x - 6

    y = 2x - 6

    2x - 6 = y |add 6 to both sides

    2x = y + 6 |divide both sides by 2

    x = 1/2y + 3

    f^{-1} (x) = 1/2x + 3

    f^{-1} (2) = 1/2 · 2 + 3 = 1 + 3 = 4
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