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Graphs

The graph of a function is the set of ordered pairs (x, f(x)), where x is in the domain of f and y = f(x).
 

 
For this function, the domain is all x and the range is all y ≥ 0 (since the graph touches the x-axis at the origin and is above the x-axis elsewhere).
 

 
For this function, the domain is all x ≥ 1 and the range is all y ≥ 2.





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