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Mathematics 10 Online
OpenStudy (anonymous):

Factor: x2 +15x-54 help plzzzz!!!!!

OpenStudy (anonymous):

(x-3)(x+18) Refoil it and you can see it

OpenStudy (anonymous):

How did you do it I must show my work

OpenStudy (anonymous):

It's hard to explain, I have done this many many times.. It was originally a guess. though. I need to 2 numbers that multiply to 54 and sum to 15. So I figured the numbers have to be far a part.Trial and error and I got -3 and 18.. There's trick to doing it too that will pretty much give you the answer everytime. http://2.bp.blogspot.com/_6t5z0H4yhhM/S7dNM-pdCrI/AAAAAAAAAPY/lqOvJGeh_8Q/s1600/factoring+trick.JPG

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