Question 73086
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Is radicalx^2=x an identity (true for all values of x)?

No. 

Let say we have x = -1

           {{{sqrt ((-1)^2)}}} = -1 ?
              {{{sqrt (1)}}} = -1
                1 = -1  -------> Not true for 1 is not equal to -1

and so as the other negative numbers.