Solving a•b=(a+b)^2 with no Identity for Real Numbers

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Show that a•b=(a+b)^2 has no identity for real numbers
Hi this is a new topic please help
Thanks
 

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An "identity" for an operation would be a member of the group, I, such at a•I= I•a= a. So you just need to show there is no number, I, such that (a+ I)^2= a for every a.
 

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