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      Question

      If x - 1/x = 9, then the value of x² + 1/ x² is:

      A 79 Correct Answer Incorrect Answer
      B 81 Correct Answer Incorrect Answer
      C 83 Correct Answer Incorrect Answer
      D 81.01 Correct Answer Incorrect Answer

      Solution

      (x - 1/x) = 9 Squaring both the sides we get, (x2 - 1/x2) = 81 + 2 (x2 - 1/x2) = 83

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