Answer :

We know that,


a3 - b3 = (a - b) (a2 + a × b + b2)


Using this formula, we get


= x (1 – 8y3)


= x [(1)3 – (2y)3]


= x (1 – 2y) [(1)2 + 1 (2y) + (2y)2]


= x (1 – 2y) (1 + 2y + 4y2)


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