Question

Find f^ −1(x) for the function.

Answer 1

Step 1. Replace f(x) with y
Step 2. Switch x and y so that x = y + 4
Step 3. Solve for y (you get y = x - 4)
Step 4. Replace y with f^-1(x)

Answer 2

convert the f(x) into y and let X as the subject