1. Warmup Factor. 1. 2. 3. 4

2. 10-3 Factoring Trinomials Objective: To factor quadratic trinomials. Standard 11.0

3. Remember… (x+2)(x+5) We used the box method to simplify this. Today, we are going to work BACKWARDS! New method…. The X BOX!!

4. Example 1 x 2 + 14x + 45 45 14 95 x2x2 45 9x 5x x x9 5 (x + 9)(x + 5) 1 st3 rd 2 nd Pick 2 #s that multiply to get the top and add to get the bottom. Those go on the sides of the X.

5. Try w/ a partner

6. Example 2 3x 2 + 10x + 8 24 10 64 3x 2 8 6x 4x 3x x2 4 (x + 2)(3x + 4) 1 st3 rd 2 nd

7. Example 3 6y 2 – 13y – 5 -30 -13 -152 6y 2 -5 -15y 2y 3y 2y-5 1 (2y – 5)(3y + 1) 1 st3 rd 2 nd

8. TOO

9. Example 3

10. Helpful X hints… + + ++ + - -- - + + big- small - - - big + small

11. Homework Pg. 579 # 28-30, 32-35, 37

12. Math Lab Warmup Factor. 1. 2. 3. 4

13. Prime Factorization

14. Find the GCF

15. Grouping Factor by grouping:

16. Try with a mathlete Factor by grouping:

17. Factoring Trinomials