How to find the domain and range of a function of a graph

The video tutorial explains how to determine the domain and range of a graph. The domain is the set of all possible X values for which the function is defined, while the range is the set of all possible Y values. The tutorial uses a continuous graph to illustrate these concepts, showing that the domain is from -4 to 4 and the range is from 0 to 4. It emphasizes using closed brackets to include boundary values and provides alternative notations for expressing domain and range.

What is the significance of closed brackets when writing the domain?

Explain how to determine the range of a graph.