SOLUTION: Someone answered this but all they did was copy and paste my question as an answer, can someone else help? Is (√x^2)= x an identity (true for all nonnegative values of x)?

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This is true ONLY for non-negative values of x. Therefore, it is not an identity, is it? An identity is true for ALL values of the variable. I suppose you could say that if you are considering ONLY non-negative values of x, then it is an identity. I guess it depends upon what you mean by "identity."

R^2 at SCC