
The equation represented by Ms. Wilson's model is n² + 13n + 40 = (n + 8)(n + 5)
The partially completed model is given as:
  |  n
  |  n²
5  | 5n  |  40
By dividing the rows and columns, the complete model is:
  |  n   | 8
n  |  n²  |  8n
5  | 5n  |  40
Add the cells, and multiply the leading  row and columns
n² + 8n + 5n + 40 = (n + 8)(n + 5)
This gives
n² + 13n + 40 = (n + 8)(n + 5)
Hence, the equation represented by Ms. Wilson's model is n² + 13n + 40 = (n + 8)(n + 5)
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