# Thread: Determine whether f and g are inverses of one another

1. ## Determine whether f and g are inverses of one another

Originally Posted by renebran
Use composition of functions to determine whether f and g are inverses of one another.
f(x)=3x;g(x)=1/3x

Use composition of functions to determine whether f and g are inverses of one another.
f(x)=3x;g(x)=

2. Originally Posted by renebran
Originally Posted by renebran
Use composition of functions to determine whether f and g are inverses of one another.
f(x)=3x;g(x)=1/3x

Use composition of functions to determine whether f and g are inverses of one another.
f(x)=3x;g(x)=
f and g are inverse if and only if f(g(x))= x and g(f(x))= x. Have you tried that?

Please don't post the same question repeatedly!

3. Originally Posted by HallsofIvy
f and g are inverse if and only if f(g(x))= x and g(f(x))= x. Have you tried that?

Please don't post the same question repeatedly!

I get the concept, I just don't understand how to work it out. I know you substitute it in.