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Mathematics 7 Online
OpenStudy (anonymous):

ac+2ad+2bc+4bd factor

OpenStudy (campbell_st):

well in the 1st pair a(c + 2d) and 2b(c + 2d) the problem is called grouping in pairs a(c+2d) + 2b(c+2d) = (a + 2b)(c+2d)

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