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(a + b)2 = 

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+1 vote
answered by (265k points)
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Best answer

Taking LHS of the identity: 
(a + b)2 

This can also be written as: 
= (a + b) (a + b) 

Multiply as we do multiplication of two binomials and we get: 
= a(a + b) + b(a + b) 
= a2 + ab + ab + b2 

Add like terms and we get: 
= a2 + 2ab + b2 

Rearrange the terms and we get: 
= a2 + b2 + 2ab 

Hence, in this way we obtain the identity i.e. (a + b)2 = a2 + b2 + 2ab

+2 votes
answered by (129 points)

A​​​​​​2+B​​​​​​2+2AB

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