(i) 8x3 + y3
Above terms can be written as,
(2x)3 + y3
We know that, a3 + b3 = (a + b) (a2 – ab + b2)
Where, a = 2x, b = y
Then, (2x)3 + y3 = (2x + y) ((2x)2 – (2x × y) + y2)
= (2x + y) (4x2 – 2xy + y2)
(ii) 64x3 – 125y3
Above terms can be written as,
(4x)3 – (5y)3
We know that, a3 – b3 = (a – b) (a2 + ab + b2)
Where, a = 4x, b = 5y
Then, (4x)3 – (5y)3 = (4x – 5y) ((4x)2 + (4x × 5y) + 5y2)
= (4x – 5y) (16x2 + 2oxy + 25y2)
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