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We are two pre-service math teachers, and have been trying to think about how to teach students in a freshman algebra class how to move between representations of quadratic functions. We realized that everything we've done starts with a quadratic equation and then asks for the graph or table. We are wondering if there is an accessible way to teach how to take a quadratic graph and write it's equation - for 9th graders! We've seen ways involving trigonometry but not anything that could be used in this lower level class. Is it possible?
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