Is the square root of negative 4.2 irrational?

Answer 1

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.