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20 March, 20:41

If f (x) and f^-1 (x) are inverse fuctions of each other and f (x) = 2x+5 what is f^-1 (8)

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  1. 20 March, 21:05
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    1.5

    Step-by-step explanation:

    first you find the inverse of the equation

    Switch the x and y so

    x=2y+5

    x-5=2y

    (x-5) / 2=y

    then you plug in 8 for x

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

    f-1 (8) = 1.5
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