1.
a) (x+y)^2-2(x+y)^2+1=x^2+2xy+y^2-2x^2-4xy-2y^2=-x^2-2xy-y^2=-(x+y)^2
b) (5x-1)^2-(3x+2)^2=25x^2-10x+1-9x^2-12x-4=16x^2-22x-5
2.
a)3x(x-6y)-2y(x+7y)=3x^2-18xy-2xy-14y^2=3x^2-20xy-14y^2
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1.
a) (x+y)^2-2(x+y)^2+1=x^2+2xy+y^2-2x^2-4xy-2y^2=-x^2-2xy-y^2=-(x+y)^2
b) (5x-1)^2-(3x+2)^2=25x^2-10x+1-9x^2-12x-4=16x^2-22x-5
2.
a)3x(x-6y)-2y(x+7y)=3x^2-18xy-2xy-14y^2=3x^2-20xy-14y^2