x3-8(x-y)3 =(x)3-{2(x-y)}3 ={x-2(x-y)} {x2+2(x-y)×x+{2(x-y)}2 =(x-2x+2y) {x2+2x2-2xy+4(x2-2xy+y2)} =(2y-x) (x2+2x2-2xy+4x2-8xy+4y2) =(2y-x) (7x2-10xy+4y2)
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