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It is -2x + 2xy
4xy - 2y(x + 4) = 4xy - 2xy - 8y = 2xy - 8y = 2y(x - 4)
They are four terms of an algebraic expression that can't be simplified
√18xy = √(9*2xy) = √9*√2xy = 3*√(2xy)
4xy - 2xy