Core 3 Maths QuestionWatch
Can someone please help with with MEI C3 June 2015 Q7 i)?
It says that f(f(x))= x hence write down f^-1(x). Why is f^-1(x)= f(x)?
In your case, it is clear that or so is an inverse, i.e .
- Study Helper
So if you have , it must mean that the function is the same as its inverse.
Alternatively you can do this:
Take of both sides to get
Then and "cancel" on the left hand side so you're left with