Mathematics
Grade10
Easy

Question

Find the product. (2a + 3b)2

  1. 4a2 + 9b2
  2. 4a2 + 12ab + 9b
  3. 4a2 – 12ab + 9b2
  4. 4a2 + 12ab – 9b2 

The correct answer is: 4a2 + 12ab + 9b


    Using the pattern (a + b)2 = a2 + 2ab + b2,
    (2a + 3b)2 = 4a2 + 2cross times2across times3b + 9b2 = 4a2 + 12ab + 9b2

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