It is rational.
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It is irrational.
Irrational.
It is rational. It is rational. It is rational. It is rational.
Yes, because when x equals 1, the square root of x is rational and the square root of -x is irrational, and when x equals -1, the square root of x is irrational and the square root of -x is rational.
No, it is neither rational nor irrational. It is a complex number.