Question

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

Answer 1

`y=2x-4 \\ Replace \ x \ by \ y:\\ x=2y-4\\ Isolate \ y:\\ 2y=x+4\\ y=(x+4)/(2)\\ \\ \boxed{d^(-1)(x)=(x+4)/(2)}`

Answer 2

Formula for inverse function:

`d^(-1)(y)=?\\y=2x-4\\2x=y+4\\x= (y+4)/(2)\\ d^(-1)(y)= (y+4)/(2)`