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19 July, 07:43

If f (x) = 1/9 x-2, what is f-1 (x) ?

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  1. 19 July, 09:44
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    Hello,

    y=1/9 x-2

    ==>x=1/9 y - 2

    ==>9x=y-18

    ==>y=9x+18

    f^ (-1) (x) = 9x+18
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