Question

Which function is the inverse of f(x) = 8x+ 4?​

Answer 1

f^-1(x)= x/8 - 1/2

Explanation:

y=8x+4

interchange the variables

x=8y+4

8y= x-4

y=x/8-1/2

so f^-1= x/8- 1/2

Answer 2

x-4 /8 = y

x=8y+4
x-4 =8y
x-4/8=y