Question

If f(x) = 5x - 1, then f^-1(x)=

Answer 1

f(-1)=5(-1)-1
-5-1
-6
Your answer is-6

Answer 2

Answer:

$f^{-1}$(x) = $\frac{x+1}{5}$

Step-by-step explanation:

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

y = 5x - 1 ( add 1 to both sides )

y + 1 = 5x ( divide both sides by 5 )

$\frac{y+1}{5}$ = x

Change y back into terms of x , with x = $f^{-1}$ (x) , then

$f^{-1}$ (x) = $\frac{x+1}{5}$