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Mathematics 15 Online
OpenStudy (anonymous):

Factor completely: 21x^3 + 35x^2 + 9x + 15

OpenStudy (nathan917):

21x^3 + 35x^2 + 9x + 15 7x^2(3x+5)+3(3x+5) =(3x+5)(7x^2+3)

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