(i) x3 + 6x2 + 12x + 16
x3 + 6x2 + 12x + 8 + 8
Above terms can be written as,
(x3 + (3 × 2 × x2) + (3 × 22 × x) + 23) + 8
We know that, (a + b)3 = a3 + b3 + 3a2b + 3ab2
Now a = x and b = 2
So, (x + 2)3 + 23
We know that, a3 + b3 = (a + b) (a2 – ab + b2)
(x + 2 + 2) ((x + 2)2 – (2 × (x + 2)) + 22)
(x + 4) (x2 + 4 + 4x – 2x – 4 + 4)
(x + 4) (x2 + 2x + 4)
(ii) a3 – 3a2b + 3ab2 – 2b3
Above terms can be written as,
a3 – 3a2b + 3ab2 – b3 – b3
We know that, (a – b)3 = a3 – b3 – 3a2b + 3ab2
So, (a – b)3 + b3
We also know that, a3 – b3 = (a – b) (a2 + ab + b2)
Where, a = a – b, b = b
(a – b – b) ((a – b)2 + (a – b)b + b2)
(a – 2b) (a2 + b2 – 2ab + ab – b2 + b2)
(a – 2b) (a2 + b2 – ab)
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