How do you get Interval Notation?

[batx27]

This sounds really dumb, I'm taking a pre-calc course which requires the domain and range to be in (), not the typical infinity<x<-infinity.

How would I get the domain and range in interval notation?

Thanks,
Ur boy Batx27

[klesl]

x∈(a;b) or x∉(a;b) or x∈(R-{a})