\(a,4x^2-4y^2=4\left(x^2-y^2\right)=4\left(x-y\right)\left(x+y\right)\\ b,x^2-xy+2x-2y=x\left(x-y\right)+2\left(x-y\right)=\left(x-y\right)\left(x+2\right)\\ c,x^2-4y^2-2x+4y=\left(x-2y\right)\left(x+2y\right)-2\left(x-2y\right)=\left(x-2y\right)\left(x+2y-2\right)\\ d,6x^2-7x+2=\left(6x^2-3x\right)-\left(4x-2\right)=3x\left(2x-1\right)-2\left(2x-1\right)=\left(2x-1\right)\left(3x-2\right)\)
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