Dilations of Quadratic Graphs

This Dilations of Quadratic Graphs 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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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