Bellwork 2-15-11 Keep it :)

Factor by grouping

1. 2xy - x2y - 6 + 3x

2. 3m2 + 9m + km + 3k

Factoring Special Products

I. Difference of Two Squares A. How do you identify?

1. only two terms2. both terms are perfect

squares3. subtraction

B. How do you factor?1. find square root of both2. write 2 ( )'s, one plus, one

minus3. insert factors* check to see if new factor is

also a Difference of Squares.

Ex A:

Ex B:

Ex C:

Ex D:

Ex E:

II. Perfect Square Trinomials A. How do you identify?

1. 1st & 3rd terms are perfect squares2. last term is positive3. 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

Ex G:

Ex H:

Ex I:

Ex J:

Ex K: