Question

If f(x)=-8x+4, then f^-1=

Answer 1

`f^(-1)`(x) =
`(4-x)/(8)`

Explanation:

let y = - 8x + 4

rearrange making x the subject

add 8x to both sides

8x + y = 4 ( subtract y from both sides )

8x = 4 - y ( divide both sides by 8 )

x =
`(4-y)/(8)`

change y back into terms of x, then

`f^(-1)`(x) =
`(4-x)/(8)`