How to determine domain and range of a quadratic function

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The graph of a quadratic function has a domain of (-∞, ∞) and range of [4, ∞). In two or more complete sentences, explain how the given range of the function can help you to determine whether the graph opens up or down.

Answered by admin @


The range of the function indicates that the function has a vertex at y=4. The number on the left in the range notation is the lowest point, the number on the right is the highest point. Since the number on the right is ∞, the graph must open up and have a minimum at 4.

Hope this helps! :)

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