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OpenStudy (anonymous):
Factor completely x^2-4x-21
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OpenStudy (anonymous):
@Vlery
OpenStudy (anonymous):
What times what gives you 21 and also can give you the sum of -4? 7 * 3 = 21 -7 + 3 = -4 so our factors are 3 and -7 so it is factored to (x -7) (x + 3)
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