Module 7: Rational Functions and Function Operations

 

In Try This 4 you may have noticed that it is sometimes easier to use the addition or subtraction of functions to solve a problem. For example, to determine the time when one investment is worth $100 more than another, you could use

 

 


Then you can estimate a solution to 100 = 1000(1.05)t − 1000(1.03)t. Without this function, you would have likely needed to guess and check using B(t) and S(t).



textbook

For an example of an application of subtracting functions, read “Example 4” on pages 481 and 482 of the textbook.

 

Self-Check 3
  1. Complete “Your Turn” from “Example 4” on page 482 of the textbook. Answer
  2. Complete question 14 on page 485 of the textbook. Answer

formula
Add the following formulas to your copy of the Formula Sheet: