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19 October, 16:00

Given the function f (x) = 3x, find the value of f-1 (27). f-1 (27) = 1 f-1 (27) = 3 f-1 (27) = 9 f-1 (27) = 81

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  1. 19 October, 16:08
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    Fun fact

    if f (a) = b then f⁻¹ (b) = a

    so

    if f⁻¹ (b) = a then f (a) = b

    so we find f (x) = 27 and the solve for x

    f (x) = 3x=27

    3x=27

    divide both sides by 3

    x=9

    so if f (9) = 27 then f⁻¹ (27) = 9

    problem solved

    answer is 9
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