Answers and Explanations
FUNCTIONS FOLLOW-UP TEST
1 . B
Solution 1: Algebra
Plug x = s − 1 into the definition of the function:
Now write an equation in which the result is equal to 1:
The smallest of these is −2, answer (B).
Solution 2: Less messy Algebra
First solve for x when the function is equal to 1:
We know that s − 1 is taking the place of x, so we can write: