factories: 2 (x-2y)^2 -50y^2
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= 2 (x-2y)^2 -50y^2
= 2 (x^2 + 4y^2 - 4xy) - 50y^2
= 2x^2 + 8y^2 - 8xy - 50y^2
= 2x^2 -42y^2 -8xy
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