Find a formula for the inverse of the given function. f(x) = x 9x − 4

Answer 1

f(x) = 9x - 4

y = f(x)

y = 9x - 4

switch x and y:

x = 9y - 4

solve for y:

(x+4)/9 = 9

-1

f(x) = (x+4)/9