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: