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Factoring ContinuedFactoring Continued“Down Under”“Down Under”
Used to factor trinomials Used to factor trinomials when a does not equal 1when a does not equal 1
ExampleExample
3 10 82y y Because of the 3, we use the down under method.
Setup:
3
Players: Factors of a times c
3 x 8 = 24
So we follow the same rules w/ + +
Factors of 24 that + to 10
6 4(3y ) (3y )+ +
# “down under” should be able to be divided into one of the binomials on top. MUST GO INTO BOTH!!!
(y + 2)(3y + 4)
ExampleExample
2 9 102t t
(2t )(2t )
2
+ +5 4
(2t + 5)(t + 2)
Your turn:Your turn:
Factor:Factor:
3 13 42x x
(x + 4)(3x + 1)
2 9 72a a
(a – 1)(2a – 7)
14 36 2 2t t 2 14 362t t (2t + 18)(2t - 4)
2
2(t + 9)(t -2)
ExampleExample
276 2 tt 3108 2 mm
6
#6#6 tt
6
3646 tt
32
3646
tt
1223 tt
8
#8#8 mm
42
4868
mm
1234 mm
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