No -6 can be expressed as a fraction (-6/1) and therefore cannot be irrational. Irrational Numbers cannot be expressed as fractions.
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No, it is not irrational because it is a square root of a negative number - which falls into the set of Complex numbers. Irrational numbers can not have an imaginary component.
If you have any positive irrational number, then its negative is also irrational.
The negative of a rational number is also rational.
No. It is -3 and can be written as a fraction, so it is rational.
irrational