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9 November, 00:00

If f (x) = 2x/7+4, which of the following is the inverse of f (x) ?

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  1. 9 November, 00:28
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    f (x) = 2x / (7 + 4)

    Replace f (x) with y

    y = 2x / (7 + 4)

    Switch x and y

    x = 2y / (7 + 4)

    Solve for y

    Simplify first

    x = 2y/11

    * 11

    11x = 2y

    /2

    5.5x = y

    Turn y into f^-1 (x)

    f^-1 (x) = 5.5x
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