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