factorise the polynomial: 8x^3-(2x-y)^3.
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A^3-B^3 = ( A-B)(A^2 + B^2 + AB)
= (2x -(2x-y)) ((2x)^2 + (2x-y)^2 + (2x)(2x-y))
= y (4x^2 + 4x^2 + y^2 -4xy + 4x^2 -2xy
= y (12x^2 + y^2 -6xy )
= (2x -(2x-y)) ((2x)^2 + (2x-y)^2 + (2x)(2x-y))
= y (4x^2 + 4x^2 + y^2 -4xy + 4x^2 -2xy
= y (12x^2 + y^2 -6xy )
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