Factoring Continued “Down Under”

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Presentation transcript:

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

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!!!

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

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

Example

Homework