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greatest common factor

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25x + 60xy + 36y

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ex. b^2+8b=7
(b+1)(b+7)
factoring special cases
ex. 16n^2-9
(4n-3)(4n=3)
perfect square tinomial
greatest common factor

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find the common factors that add to one and multiplies to the other one

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subtraction

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10x²+71x+7

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x^2-64=(x+8)(x-8)