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      Question

      What is the HCF of   (x4  - x2  - 6)    and  

      (x4  - 4x2  + 3) ? (a)  x2  - 3                          (b)    x + 2  (c)   x + 3                         (d)   x2  + 3
      A (a) Correct Answer Incorrect Answer
      B (b) Correct Answer Incorrect Answer
      C (c) Correct Answer Incorrect Answer
      D (d) Correct Answer Incorrect Answer

      Solution

      x4  - x2  - 6 = (x2  - 3) (x2 + 2) And x4  - 4x2  +3 = (x2  - 3) (x2  -1)  HCF = (x2 - 3)

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