1. Bellwork 2-15-11 Keep it :) Factor by grouping 1. 2xy - x 2 y - 6 + 3x 2. 3m 2 + 9m + km + 3k

2. Factoring Special Products I. Difference of Two Squares A. How do you identify? 1. only two terms 2. both terms are perfect squares 3. subtraction B. How do you factor? 1. find square root of both 2. write 2 ( )'s, one plus, one minus 3. insert factors * check to see if new factor is also a Difference of Squares.

3. Ex A: Ex B:

4. Ex C: Ex D:

5. Ex E:

6. II. Perfect Square Trinomials A. How do you identify? 1. 1st & 3rd terms are perfect squares 2. last term is positive 3. 1st x 3rd x 2 = middle term B. How do you factor? 1. find square root of 1st & 3rd 2. write 1 ( )'s squared, either plus or minus (see middle term) 3. insert factors

7. Ex G: Ex H:

8. Ex I: Ex J:

9. Ex K: