(10x +5y)(5y +10x) = 50xy + 100x^2 + 25y^2 + 50xy = 100x^2 + 100xy + 25y^2 Being alert, you might have noticed that we have 5(2x+y)(5)(2x+y) = 25(2x+y)^2 = 25(4x^2 + 4xy + y^2)
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