Some questions on functions require students to understand the difference between ff-1 and f-1f. Though both = x, they are two different functions because their domains might be different.
while 
Therefore,
while 
Example f(x) = x+2, x> 0
Some questions on functions require students to understand the difference between ff-1 and f-1f. Though both = x, they are two different functions because their domains might be different.
while
Therefore,
while
Example f(x) = x+2, x> 0
