Question

If f(x) = 5x + 4, what is the inverse of f(x)

Answer 1

Answer:

f^-1(x)= 1/5x - 4


To get the inverse, swap the x and y variables ( f(x) becomes x, x becomes f(x)) and then solve for y again:

x=5f(x)+4
x-4=5f(x)
1/5x=f(x)