Find f -1(x) for the one-to-one function
Hello keadyjrWhat you have to do here is to let , and then make the subject of the formula.
So
, say.
So what now have is that (in other words, is the function that maps onto ), and . So maps back onto . Therefore is therefore the inverse of ; i.e.
Now it doesn't matter what letter is used for the parameter that's fed into a function, and it's usual to use rather than . So we would usually write:
I hope that clears it up OK.
Grandad