factorize(x - y)^2 - (x² - y^2) + 12 (x+y)^2
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Answer: 6x^2 + 20y^2 + 20xy
Step-by-step explanation: (x-y)²-7(x²-y²)+12(x+y)²
=x²+y²-2xy-7x²+7y²+12(x²+y²+2xy)
=-6x²+8y²-2xy+12x²+12y²+24xy
=6x²+20y²+20xy
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