math

Find the inverse of each of these functions
a)f(x)=x/x+2
b)f(x)=2x/5-x
c)f(x)=3x/2x+1

asked by jason


  1. x =2y/5 -y
    5x = 2y -5y
    5x = -3y
    F(x) = -5x/3

    posted by Anonymous
  2. 1st one:

    if f(x) = x/(x+2) , then y = x/(x+2)

    step1: interchange the x and y variables to get the inverse as

    x = y/(y+2)

    step 2: solve this new equation for y

    x = y/(y+2)
    xy + 2x = y
    xy - y = -2x
    y(x-1) = -2x
    y = -2x/(x-1) or y = 2x/(1-x)

    f^-1 (x) = 2x/(1-x)

    now do the same for others following these two steps.

    posted by Reiny

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