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1 June, 04:50

If f (x) = 3x+9, what is f-1 (x) ?

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  1. 1 June, 05:19
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    F inverse? then:

    let's consider 3x + 9 as y.

    so:

    y = 3x + 9

    y - 9 = 3x

    x = y/3 - 3

    now replace y with x and you get the inverse.

    f^-1 (x) = x/3 - 3
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