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      Question

      If x2 – 8√2x + 1 = 0, then what

      is the value of x3 + 1/x3.
      A 1024√2 Correct Answer Incorrect Answer
      B 1000√2 Correct Answer Incorrect Answer
      C 512√2 Correct Answer Incorrect Answer
      D 256√2 Correct Answer Incorrect Answer

      Solution

      Since, x2 – 8√2x + 1 = 0 Or, x + 1/x = 8√2 So, x3 + 1/x3 = (x + 1/x)3 – 3(x + 1/x) = 1024√2 – 24√2 = 1000√2

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