Verify if f(x)=1/2x-2 (and g(x) )= 2x + 4 are inverses.

To find an inverse you switch x and y for a function and solve for y. I will do fx.
X=1/2f(x)'-2
X+2=1/2f(x)'
2x+4=f(x)'
I used ' to represent inverse and since f(x)' =g(x) it is verified