1. Skills Check Factor. 1. x 2 + 2x – 15 2. x 2 + 14x + 24 3. 2x 2 + 6x – 36 4. 3x 2 + 13x + 4 5. 4x 2 + 16x + 15

2. Difference of Two Perfect Squares

3. Difference of Squares A binomial with a subtraction sign in between terms that are both PERFECT SQUARES

4. To Factor Difference of Squares One parenthesis is a plus and one is a minus. Take the square root of each term.

5. Example

10. Perfect Square Trinomials These are special too, but can be done using our usual method of factoring trinomials

11. Example