What if we try sticking a negative number in?
A -3 went in... but, a 3 came out! These don't work for negative numbers. So, for this one, we have to say
|These are inverse functions only when||:|
(This will be even clearer later.)
The official notation for the inverse function of a guy named f(x) is
(read as "f inverse of x.")
* The little "-1" is NOT an exponent! It's just a notation. Hey -- they didn't ask ME about this stuff when they made it up!
I know you're really excited about this... But, you don't know enough to try any problems yet. Keep reading!