(i) a3 + b3 + a + b
We know that, a3 + b3 = (a + b) (a2 – ab + b2)
[(a + b) (a2 – ab + b2)] + (a + b)
(a + b) (a2 – ab + b2 + 1)
(ii) a3 – b3 – a + b
(a3 – b3) – (a – b)
We know that, a3 – b3 = (a – b) (a2 + ab + b2)
[(a – b) (a2 + ab + b2)] – (a – b)
(a – b) (a2 + ab + b2 – 1)
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