Inverse Funtions

Question

Assume that the function  is a one-to-one function.

(a) If , find .Your answer is  

 (b) If , find .Your answer is 

Answer 1

(a) f^-1(9) = 2

(b) f(- 4) = - 2

Answer 2

Yefim is right.

whenever you are given an x value, the y (or f(x)) that corresponds to it tells you what you want to know. they tell you an x, then the f(x) is the corresponding y that goes with your given x. if they ask what is f(8), find 8 in the x's and the corresponding y is your answer.

if they ask f^-1(4), then you find 4 in the y's, and your answer is the corresponding x.