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4\left(x^{2}-2xy+y^{2}\right)-2\left(x-y\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-y\right)^{2}.
4x^{2}-8xy+4y^{2}-2\left(x-y\right)
Use the distributive property to multiply 4 by x^{2}-2xy+y^{2}.
4x^{2}-8xy+4y^{2}-2x+2y
Use the distributive property to multiply -2 by x-y.
4\left(x^{2}-2xy+y^{2}\right)-2\left(x-y\right)
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-y\right)^{2}.
4x^{2}-8xy+4y^{2}-2\left(x-y\right)
Use the distributive property to multiply 4 by x^{2}-2xy+y^{2}.
4x^{2}-8xy+4y^{2}-2x+2y
Use the distributive property to multiply -2 by x-y.