Question

If f(x) = 4x - 3, what is f(x)^-1

Answer 1

Answer:

$f^{-1}$(x) = $\frac{x+3}{4}$

Step-by-step explanation:

let y = f(x) and rearrange making x the subject, that is

y = 4x - 3 ( add 3 to both sides )

y + 3 = 4x ( divide both sides by 4 )

$\frac{y+3}{4}$ = x

Change y back into terms of x

$f^{-1}$(x) = $\frac{x+3}{4}$