(a + b)3 = ?

A a3 + b3 + 3ab(a + b)

B a3 + 3a2b + 3ab + b3

C a3 + 3ab + 3ab2 + b3

D a3 + b3 - 3ab(a + b)

Solution

Correct Answer: Option A

(a + b)3 = a3 + 3a2b + 3ab2 + b3
             = a3 + b3+ 3a2b + 3ab2 
             = a3 + b3 +3ab(a + b)
             

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