What is the set of numbers to which #sqrt(82/20)# belong?

1 Answer
Nov 9, 2016

Being a radical (root) expression, it would at first belong to the set of irrational numbers.


We could see if things can be taken out from under the radical sign:

But that's about all.

It is an irrational number, which is a subset of the real numbers.
("irrational" meaning that the number cam't be written as a fraction).