Mathematics
Grade10
Easy

Question

Find the product. (0.4x + 1.2)2

  1. 0.16x2 + 1.44
  2. 0.16x2 + 0.96x + 1.44
  3. 0.16x2 – 0.96x + 1.44
  4. 0.16x2 – 0.96

The correct answer is: 0.16x2 + 0.96x + 1.44


    Using the pattern (a + b)2 = a2 + 2ab + b2,
    (0.4x + 1.2)2 = 0.16x2 + 2cross times0.4xcross times1.2 + 1.44 = 0.16x2 + 0.96x + 1.44

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