1. 5-Minute Check on Chapter 2
Transparency 3-1
5-Minute Check on Chapter 2
Evaluate 42 - |x - 7| if x = -3
Find 4.1  (-0.5)
Simplify each expression
3. 8(-2c + 5) + 9c (36d – 18) / (-9)
A bag of lollipops has 10 red, 15 green, and 15 yellow lollipops. If one is chosen at random, what is the probability that it is not green?
Which of the following is a true statement
Standardized Test Practice: A
8/4 < 4/8 B
-4/8 < -8/4 C
-4/8 > -8/4 D
-4/8 > 4/8
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2. Rational Expressions with Like Denominators
Lesson 12-6
Rational Expressions with Like Denominators

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Transparency 6

4. Transparency 6a

5. Objectives Add rational expression with like denominators
Subtract rational expression with like denominators

6. Vocabulary
None new

7. Key Concept
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8. Example 1 Find The common denominator is 15. Add the numerators. 4b
Divide by the common factor, 5. 4b 3
Simplify.
Answer:

9. Example 2 Find The common denominator is c + 2. Factor the numerator.
Divide by the common factor, c + 2. 1
Simplify.
Answer:

10. Example 3
Geometry Find an expression for the perimeter of rectangle WXYZ.
Perimeter formula

11. Example 3 cont The common denominator is Distributive Property
Combine like terms.
Factor.
Answer: The perimeter can be represented by the expression

12. Example 4 Find The common denominator is x - 3
The additive inverse of (x – 5) is –(x – 5)
Distributive Property
Simplify.
Answer:

13. Example 5 Find Rewrite using common denominators
The denominator s – 11 is the same as - (-s + 11) or - (11 – s). Rewrite the second expression so that it has the same denominator as the first.
Rewrite using common denominators
The common denominator is
Simplify.
Answer:

14. Summary & Homework
Summary:
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Homework: pg