darlaberry darlaberry

25-11-2017
Mathematics

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factor the trinomial x^2 - 2x - 8
(x+4)(x-2)
(x-8)(x+1)
(x+8)(x-1)
(x-4)(x+2)

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Plasmataco Plasmataco

25-11-2017

Well what two numbers multiply to get -8 and add to get -2?
Well, to get -8, we either have (-1,8),(-2,4),(-4,2),(-8,1)
8-1=7
-2+4=2
2-4=-2
1-8=-7
Thus it should be (-4,2),
This means we should get (X-4)(X+2)

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