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OpenStudy (anonymous):
Factor completely 9x^2 + 9x -28
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myininaya (myininaya):
9(-28)=21*(-12) and 21-12=9 so we can factor this poly. 9x=21x-12x we will use this substitution ^ | 9x^2+21x-12x-28 =3x(3x+7)-4(3x+7) =(3x+7)(3x-4)
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