Lesson 1
1. Lesson 1
1.8. Explore 4
Module 5: Rational Expressions
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.
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
- Determine the non-permissible values.
- Complete questions 10.b. and 10.d. on page 223 of your textbook. Answers