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Explanation & Answer
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Domain is the range of x - values of the graph. Here the graph extends indefinitely on both ends. So the domain is ( - infinity, infinity ).
Range is the range of y - values of the graph. Here the lowest point on the graph is (0, -2). Hence the lowest y value is -2. Since there is no highest point on the graph, the range is [ -2, infinity).
Yes, the graph is a function because it passes the vertical line test. When you draw a vertical line, it passes through the graph only once.
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