Question

Confirm that f and g are inverses by showing that f(g(x)) = x and g(f(x)) = x.

f(x) = 9x + 3 and g(x) = Quantity x minus three divided by nine

Answer 1

f(x) = 9x + 3 and g(x) = (x -3)/9
So just plug one in for x into the other.

f(g(x)) = 9((x-3)/9)+3
g(f(x)) = ((9x+3)-3)/9

Answer 2

thanks