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27 November, 10:07

Let f (x) = 2x - 6. solve f-1 (x) when x = 2. select one: a. - 5 b. 4 c. - 2 d. 7

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  1. 27 November, 13:41
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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

    Answer: b. 4
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