Answer :
ab2 + (a – 1)b -1
= ab2 + ba – b – 1
= (ab2 + ba) – (b + 1)
= ab (b + 1) - 1(b + 1)
= (b + 1)(ab – 1)
So we get,
ab2 + (a – 1)b -1 = (b + 1)(ab – 1)
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