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This Dilations of Quadratic Graphs instructional video also includes:
Challenge: Sketch a graph of a quadratic function without making a table of values. High schoolers learn how different parameters affect the graph of a quadratic function. The problem video focuses on dilations of quadratic graphs.
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Concepts
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Instructional Ideas
- Use the video to review transformations of quadratic graphs
Classroom Considerations
- Note that the concept video covers more than dilations (covers all transformations, including vertical and horizontal shifts)
- Concept video uses a TI-84 Plus graphing calculator; be sure pupils can apply the process to their own calculators
Pros
- Video introduces a way for learners to remember the effect of a negative coefficient
Cons
- Speaker uses words that don't exist, such as negativise
- Concept video describes horizontal shifts as side-to-side movement, but it does not distinguish how to determine whether the shift is to the right or left
- Resource breezes through examples at a rather quick pace