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28 December, 10:28

If f (x) = 2x+1/x-4, what is the value of f^-1 (3) ?

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  1. 28 December, 14:20
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    => y = (2x + 1) / (x - 4)

    => xy - 4y = 2x + 1

    => xy - 2x = 4y + 1

    => x (y - 2) = 4y + 1

    => x = (4y + 1) / (y - 2)

    => f-1 (x) = (4x + 1) / (x - 2)

    subtitute x = 3

    => f-1 (3) = 13
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