**Fractional (Rational) Exponents | Purplemath**
https://www.purplemath.com/modules/exponent5.htm

So if they give you, say, x 3/6, then x had better not be negative, because x 3 would still be negative, and you would be trying to take the sixth root of a negative number. If they give you x 4/6, then a negative x becomes positive (because of the fourth power) and is then sixth-rooted, so it becomes | x | 2/3 (by reducing the fractional power). On the other hand, if they give you something ...

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