Thank you for the opportunity to help you with your question!
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.
Please let me know if you need any clarification. I'm always happy to answer your questions.
Dec 11th, 2015
Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.