Multiple Choice Question (MCQ)

If f : R → R such that f(x)=5x+4 then which of the following is equal to f^{-1}(x).

  1. ×

    \dfrac{x-5}{4}

  2. \dfrac{x-4}{5}

  3. ×

    \dfrac{x+4}{5}

  4. ×

    \dfrac{x}{5} -4

Collected in the board: Inverse function

Steven Zheng posted 1 month ago


Answer

  1. Let y=5x+4

    Express x in terms of y

    x=\dfrac{y-4}{5}

    Therefore, its inverse function is

    f^{-1}(x)=\dfrac{x-4}{5}

Steven Zheng posted 1 month ago

Scroll to Top