Interval Notation and how is it used?

Question

anonymous · Answer

interval notation is another method for writing domain and range.In set builder notation braces (curly parentheses {} ) and variables are used to express the domain and range. Interval notation is often considered more efficient. in interval notation, there are only 5 symbols to know:

    Open parentheses ( ) 
    Closed parentheses [ ] 
    Infinity ∞
    Negative Infinity −∞
    Union Sign ∪

anonymous · Answer

The things with infinity in parentheses confuse me. whats to know about that?

anonymous · Answer

you always use parentheses with infinity

anonymous · Answer

Like the points? I think its domain and range.

anonymous · Answer

this might help. http://cnx.org/content/m15265/latest/