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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