No, they are quite real. It is just that in some situations it makes sense to use negative numbers, in others not.
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1,2,3,4,5,6,1/2, 3/4 these are all real. the square root of negative is an unreal number.
Yes.For example, any number divided by 0 is unreal. There is no defined representation of (i.e.) 12/0.
A negative plus a negative still gives a negative answer.
A positive number. Positive Number x Positive Number = Positive Number Positive Number x Negative Number = Negative Number Negative Number x Negative Number = Positive Number
negative.