1. Chapter 4: Algebraic Fractions Lesson 3 Addition and Subtraction UNIT TEST # 1 - Jan 24

2. OBJECTIVES Add and subtract rational expressions with the same denominators Find the LCD of rational expressions Add and subtract rational expressions with different denominators

3. Let’s have a drill! Find the sum or difference of the following:

4. ADDITION AND SUBTRACTION

5. Solve as indicated.

7. When denominators differ only by sign, we can make them equal by changing the sign of the numerator. The denominator is changed to -1(b – 2) by factoring out -1. The numerator –a is changed to a and the denominators are now the same.

8. Try this!!! Add or subtract.

9. HOMEWORK (1/2 crosswise)

10. LCM – is the smallest expression that is divisible by each of the given expressions LCD – LCM of the denominators To Find the LCM: 1. Factor each denominator into prime factors. 2. List each different factor the greatest number of times it appears in any denominator.

11. Find the LCD for

12. 1. Factor each denominator into prime factors. 2. List each different factor the greatest number of times it appears in any denominator.

13. Find the LCD for 1. Factor each denominator into prime factors. 2. List each different factor the greatest number of times it appears in any denominator.

14. Find the LCD for 1. Factor each denominator into prime factors. 2. List each different factor the greatest number of times it appears in any denominator.

15. Find the LCD of the ff expressions:

16. Rewrite the algebraic fraction with the indicated denominator.

19. TRY THIS! Rewrite the algebraic fraction with the indicated denominator.

20. Add or subtract.

23. TRY THIS!!! You may work in pairs. (Notebooks) Book2 Page 128 Nos. 1 - 8

24. HW Book2 Page 128 Nos. 9 - 12 ½ crosswise pad paper (to be submitted tomorrow)