Which is the inverse fuction of f (x) = 4x

f (x) = 4x

To find the inverse, first change f (x) to y:

y = 4x

Now switch the variables:

x = 4y

Solve for Y:

Divide both sides by 4:

y = x/4

Now replace y with the inverse function f^-1 (x):

f^-1 (x) = x/4