Consider the attached function - the values are?

To find the value f(-7), we just need to evaluate the function at . In other words, we are going to replace  with -7 in the function:




Similarly, to find the value of f(5), we just need to evaluate the function at . In other words, we are going to replace  with 5 in the function:




We can conclude that  and 

The answer is part a: use