16-y^2 jjjjjjjjjjjjjjjjjjjjjjjjj

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16-y^2 jjjjjjjjjjjjjjjjjjjjjjjjj

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16 - у^2 = 4^2 - у^2 = (4 - у)*(4+у) = (4-у)*(у+4)

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