Question : What is the value of (a + b)3 – a3 – b3?
Option 1: – 3ab(a – b)
Option 2: 3ab(a + b)
Option 3: – 3ab(a + b)
Option 4: 3ab(a – b)
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Correct Answer: 3ab(a + b)
Solution : (a + b) 3 – a 3 – b 3 = a 3 + b 3 + 3ab(a + b) – a 3 – b 3 = 3ab(a + b) Hence, the correct answer is 3ab(a + b).
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