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Mathematics 21 Online
OpenStudy (anonymous):

factor x^2+14xy+49y^2-4a^2

OpenStudy (dumbcow):

7*7 = 49 and 7+7 = 14 --> (x+7y)^2 - 4a^2

OpenStudy (dumbcow):

this is a difference of squares (a^2 -b^2) = (a-b)(a+b) --> (x+7y-2a)(x+7y+2a)

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