Determine whether f and g are inverses of one another

• Feb 23rd 2010, 03:42 PM
renebran
Determine whether f and g are inverses of one another
Originally Posted by renebran http://www.mathhelpforum.com/math-he...s/viewpost.gif
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)=http://www.mathhelpforum.com/math-he...90d92572-1.gif
• Feb 23rd 2010, 04:24 PM
HallsofIvy
Quote:

Originally Posted by renebran
Originally Posted by renebran http://www.mathhelpforum.com/math-he...s/viewpost.gif
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)=http://www.mathhelpforum.com/math-he...90d92572-1.gif

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!
• Feb 23rd 2010, 04:47 PM
renebran
Quote:

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.