Mathematics
Grade10
Easy

Question

Find the product. (5k - 1)(5k + 1)

  1. 25k2 - 1
  2. 25k2 - 1
  3. 25k2 + 2k - 1
  4. 25k2 - 2k – 1

The correct answer is: 25k2 - 1


    Using the pattern (a + b)(a – b) = a2 – b2,
    (5k + 1)(5k – 1) = 25k2 – 1

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