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      Question

      If total number of factors of 1,800 is 'x', then find

      the value of (x - 8) (x + 4).
      A 1140 Correct Answer Incorrect Answer
      B 1080 Correct Answer Incorrect Answer
      C 1200 Correct Answer Incorrect Answer
      D 1120 Correct Answer Incorrect Answer

      Solution

      Factors of 1,800 = 2Β³ Γ— 3Β² Γ— 5Β² So, total number of factors = (3 + 1) (2 + 1) (2 + 1) = 4 Γ— 3 Γ— 3 = 36 Required value = (x - 8) (x + 4) = 28 Γ— 40 = 1120

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