No, it is not even a real number. It is an imaginary number.
Irrational.
Yes, the square root of negative 4.2 is considered an irrational number because it involves the square root of a negative value, which results in an imaginary number. Specifically, the square root of negative 4.2 can be expressed as (i\sqrt{4.2}), where (i) is the imaginary unit. Since (\sqrt{4.2}) is an irrational number, the entire expression remains irrational.
It's irrational/not a real number
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.
The square root of negative 36 is an imaginary number and therefore not an irrational number. For a number to be irrational it must first be real.
yes; the negative square root of 2 is irrational, for example.
Yes.
No, it is neither rational nor irrational. It is a complex number.
The negative square root of 49 is -7. -7 is whole, integer, and rational number. It's not a natural or irrational number.
It is neither because the square root of -18 is an imaginary number but the square root of 18 is irrational
It is all of them except for irrational.
The square root of 51 is an irrational number and it is about 7.14128429