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OpenStudy (anonymous):
factor 4-a^2-2ab-b^2
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OpenStudy (anonymous):
4-a^2-2ab-b^2 =4 - (a^2+2ab+b^2) = (2)^2 - (a+b)^2 =(2-a-b)(2+a+b) =-(a+b-2)(a+b+2)
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