Q : 2    Consider, the special case of Identity (IV) with a = b, what do you get? Is it
            related to Identity (I)?

Answers (1)

Identity IV is  \Rightarrow (a +x)(b+x) = x^{2} + (a+b)x + ab
If a =b than

                (a + x)(a + x) = x^{2} + (a+a)x + a\times a
                (a+x)^{2} = x^{2} + 2ax + a^{2}
Which is identity I

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