Prompt 28: Expanding Double Brackets

  1. Do you have an agreed departmental structure?
  2. Which method is slowest? Which method is quickest?
  3. Should we teach more than one method? i.e. On first learning, teach cell 3, but then transfer to cell 2?
  4. Which method extends most naturally to three or more brackets?
  5. Should cell 2 and cell 4 come with a discussion of the distributive property, or an intermediate step showing this? i.e. (x + 3)(x – 5) = x(x – 5) + 3(x – 5)?
  6. Additional thinking:

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