1. Factoring Review

2. Factoring The process of rewriting an equation or expression as the product of its factors Example: x 2 + 3x + 2 = (x + 2)(x + 1) Most common form is the quadratic form: ax 2 + bx + c, a ≠ 0

3. Factoring (when a = 1) ax 2 + bx + c = (x + ___ ) (x + ___ ) multiply to equal c and add up to equal b You can always check your answer by FOIL-ing!

4. Finding Factors of C 1. Identify the value of c 2. On your calculator, go to the y= screen 3. Type C/X into y1 4. Go to the table 5. Any whole numbers (positive, non- decimal numbers) in the y1 column are factors of c

5. Example

6. Example #1

7. Example #2

8. Example #3

9. Your Turn: Complete problems 1 – 3 on the “Factoring Practice” handout Check your answer by FOIL-ing!

10. 1. (x + 9)(x + 2) 2. (y – 7)(y + 5) 3. (g – 6)(g + 2)

11. Difference of Squares When we use it: Usually in the form ax 2 – c Both a and c are perfect squares (the square root of each number is a whole number)

12. Example #1

13. Example #2

14. Your Turn: Complete problems 4 – 10 on the “Factoring Practice” handout Remember to check your answer by FOIL-ing!

15. 4. 5. 6. 7. 8.

17. Factoring (when a ≠ 1): The Welsh Method 1. Multiply c and a 2. Rewrite the expression with the new value for c 3. Write (ax + )(ax + ) 4. Finish “factoring” the new expression 5. Reduce each set of parentheses by any common factors

18. Example #1

19. Example #2

20. Example #3

21. Your Turn: Complete problems 11 – 20 on the “Factoring Practice” handout Don’t forget to check by FOIL-ing!

22. 11. 12. 13. 14. 15. 16.

24. GCF (Greatest Common Factor) When we use it: all the terms share 1 or more factors Factoring out GCFs save us time!!! 4x 2 – 196 = 0 (2x + 14)(2x – 14) = 0

25. GCF (Greatest Common Factor) Steps: 1. Identify any common factor(s) (including the GCF) 2. Factor out the common factor(s) 3. Factor the remaining expression if possible

26. Example #1

27. Example #2

28. Example #3

29. Your Turn: Complete problems 17 – 27 on “Factoring Practice” handout

30. 17. 18. 19. 20. 21. 22.

31. 23. 24. 25. 26. 27.

33. GCFs and The Welsh Method Make sure you factor out any GCFs or the Welsh Method doesn’t work!!!

34. Your Turn: Complete problems 28 – 33 on the “Factoring Practice” handout using the GCF and the Welsh Method

35. 28. 29. 30. 31. 32. 33.

37. Picking the Correct Method 34. x 2 + 10x + 16

38. Picking the Correct Method 35. 5t 2 + 28t + 32

39. Picking the Correct Method 36. 27p 2 – 9p

40. Your Turn: Completely factor problems 37 – 44 on the “Factoring Practice” handout. In your solution, state the method(s) you used to completely factor the expression.

41. 37. 38. 39. 40.

42. 41. 42. 43. 44.