Question

If ƒ (7) = 22, thenf-¹(f(7)) = [?]

Answer 1

Remember the following property of invertible functions:

`f(x)=y\qquad\Leftrightarrow\quad f^(-1)(y)=x`

Then:

`f^(-1)(f(x))=x\qquad\forall x`

Then:

`f^(-1)(f(7))=7`

Therefore, the answer is: 7.