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OpenStudy (anonymous):
I don't know how to factor this problem 4x squared +8x -21
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OpenStudy (anonymous):
(2x-3)(2x+7)
OpenStudy (anonymous):
First,find ac (4*-21).Which equals -84.Then find teh factors of 84.The 2 factors that have a product of -84 and a sum of 8 are needed for the next step.
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