Sqrt(4) is +/- 2 so it is rational, not irrational. The question, therefore, makes no sense.
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No. Radical(9) is +3 or -3, both of which are rational.
No. Radical(1.21) = 1.1, for example, is rational.
A negative irrational number can be thought of as an irrational number multiplied by -1, or an irrational number with a minus sign in front of it.
it's called the radical sign
It was invented, not discovered.