SOLUTION: What property is used in 2-2?

Question 563308: What property is used in 2-2?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
2-2 = 0, not much of an arithmetic property. However, the number -2 functions as the "inverse element" of 2. Generally speaking, if e is an identity element, * is a binary operation, and x is some number (2 in this case) then there exists a y such that x*y = e for all x.
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