1. Factoring Continued “Down Under”
Used to factor trinomials when a does not equal 1

2. Example (3y + 6 ) (3y + 4 ) 3 (y + 2)(3y + 4)
Because of the 3, we use the down under method.
Players: Factors of a times c
Setup:
3 x 8 = 24
(3y + 6 )
(3y + 4 )
So we follow the same rules w/ + + 3
Factors of 24 that + to 10
(y + 2)(3y + 4)
# “down under” should be able to be divided into one of the binomials on top. MUST GO INTO BOTH!!!

3. Example
(2t + 5
)(2t + 4 ) 2
(2t + 5)(t + 2)

4. Your turn: Factor: (x + 4)(3x + 1) (a – 1)(2a – 7) (2t + 18)(2t - 4) 2

5. Example

7. Homework