1. Lesson 1

1.8. Explore 4

Mathematics 30-2 Module 5

Module 5: Rational Expressions

 

This is a humorous picture of a group of people standing outside the “Denominator Club” and the “Numerator Club.”

In Try This 2, you found the non-permissible values for a variety of expressions by letting the denominator equal 0 and solving for the variable. These non-permissible values are also called restrictions.



textbook

Review “Example 3” on pages 219 and 220 of your textbook to see how you can determine non-permissible values for rational expressions that are similar to the expressions in Try This 2. As you read, think about the following questions:

  • How are the equations to find non-permissible values created?
  • Why is it not necessary to determine when numerators are equal to 0?
  • How does factoring the denominator make it easier to identify non-permissible values?

Look back at your answers to Try This 2. After reading through “Example 3,” are there any answers you would change? Why?

 

Self-Check 2
  1. Determine the non-permissible values.

    Answers


 

textbook

  1. Complete questions 10.b. and 10.d. on page 223 of your textbook. Answers