Q : 1    Put -b in place of b in identity 1. Do you get identity 2?

Answers (1)

Identity 1 \Rightarrow (a+b)^{2} = a^{2} + 2ab + b^{2}
 If we replace b with -b in identity 1 
We get,
              a^{2} + 2a(-b) + (-b)^{2} = a^{2} - 2ab + b^{2}
which is equal to 
                        (a-b)^{2}    which is identity 2
So, we get identity 2 by replacing b with -b in identity 1

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