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27 August, 12:12

If f (x) and f-1 (x)

are inverse functions of each other and f (x) = 2x+5, what is f-1 (8) ?

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Answers (2)
  1. 27 August, 12:27
    0
    3/2 B

    Step-by-step explanation:

    Edge
  2. 27 August, 12:30
    0
    For this case we have the following function:

    f (x) = 2x + 5

    Clearing x we have:

    2x = y - 5

    x = (y-5) / 2

    Rewriting:

    f (x) ^ - 1 = (x-5) / 2

    Evaluating x = 8:

    f (8) ^ - 1 = (8-5) / 2

    f (8) ^ - 1 = 3/2

    Answer:

    f (8) ^ - 1 = 3/2

    option 2
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