I've added a picture with the information about the relation.

Reflexive: I'd say it's reflexive since x*x would stiil belong to the rational numbers, right?

But is it enough to just write that, or do I need to do something more?

Symmetric: Again I'd say it is symmetric because multiplication is commutative.

Is that enough? xD

Transitive: No idea, I'm so bad at transitive, so any help would be appreciated, thanks!