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Answer:
-9 < x < 6 or (-9, 6)
Step-by-step explanation:
The domain is the horizontal extent of the graph. Here, the graph is defined for all values of x between -9 and +6, but not for those end values. (The open circles mean those points are not included in the graph.)
As an inequality, the domain is ...
-9 < x < 6
In interval notation, the domain is ...
(-9, 6)
______
Additional comment
Round brackets (parentheses) are used in interval notation to indicate the point is not included. Square brackets [ ] are used when the end points are included. The brackets may be mismatched if on end is part of the domain, but the other is not.
