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Answer:
- domain: [2, 6]
- range: [6, 18]
Explanation:
The domain is the horizontal extent of the graph. When end points are involved, you have to be able to tell if they are included in the function definition, or not. Here, the solid dots mean both end points are included.
The graph extends horizontally from 2 to 6. You read this from the "x" scale at the bottom. As an inequality, the domain is written ...
2 ≤ x ≤ 6
In interval notation, it is [2, 6]. Square brackets are used to indicate the end point values are included.
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The range is the vertical extent of the graph. This one extends from y=6 to y=18. You read this from the "f(x)" scale on the left. The range can be written as ...
6 ≤ y ≤ 18
[6, 18]