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Mathematics 21 Online
OpenStudy (anonymous):

I need help on how to factor x^2+x-2

OpenStudy (marissalovescats):

So we know that we need the number 2 and 1 because 2 times 1 is two and we can add/subtract to and 1 to get +1. So we know that -2 times 1 is -2 But is -2+1 positive 1? No its negative so that's out. What bout 2 and -1? 2 times -1 is -2 And 2 -1 is 1 so that will be what we use. (x-1)(x+2) And we can check it by FOILing it.

OpenStudy (anonymous):

I ha done that and it gave me x^2 wait nvr mind I found my mistake and thanks for your help I appreciated it it helped me on what I did wrong

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