Question

What is the inverse function of d(x) = 2x - 4?

Answer 1

Answer:

$d^{-1}$(x) = $\frac{x+4}{2}$

Step-by-step explanation:

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

2x - 4 = y ( add 4 to both sides )

2x = y + 4 ( divide both sides by 2 )

x = $\frac{y+4}{2}$

Change y back into terms of x, so

$d^{-1}$(x ) = $\frac{x+4}{2}$