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OpenStudy (anonymous):
Factoring Trinomials with Negative Numbers x2 + x – 12 6. x2 – 2x – 8
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OpenStudy (anonymous):
If you FOIL (x+4)(x-3) what do you get?
OpenStudy (anonymous):
ok thnk
OpenStudy (anonymous):
u got it? great!
OpenStudy (anonymous):
#6 is kinda hard in a way
OpenStudy (anonymous):
you need factors of -8 that sum to -2
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OpenStudy (anonymous):
-1*8 1*-8 -2*4 2*-4
OpenStudy (anonymous):
which pair adds up to -2?
OpenStudy (anonymous):
need help?
OpenStudy (anonymous):
yeah im so lost
OpenStudy (anonymous):
Here is the factored version of #6: (x+2)(x-4)
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OpenStudy (anonymous):
F O I L watch what happens when I FOIL it: x^2 -4x +2x -8
OpenStudy (anonymous):
Thanks
OpenStudy (anonymous):
now simplify the middle two terms =x^2 -2x -8 notice how the factors of 8=-4*2 add up to the middle term -2? then look at the factored form and you see the -4 and +2 in the factors
OpenStudy (anonymous):
good?
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