• Question

      If x + 1/x = 5 then find out the value of x⁵ + 1/(x⁵)?

      A 1525 Correct Answer Incorrect Answer
      B 2530 Correct Answer Incorrect Answer
      C 2525 Correct Answer Incorrect Answer
      D 2025 Correct Answer Incorrect Answer

      Solution

      If x + (1/x) = 5 Then x2 + 1/x2= 23 and x3 + 1/x3 = 110 so x5 + 1/x5 = (x2 +1/x2) (x3 +1/x3) - (x + 1/x) x5 + 1/x5= (23 × 110) - (5) => 2530 - 5 = 2525 Formula used: If x + 1/x = a x2 +1/x2 = a²- 2 x + 1/x = a x3 +1/x3= a³ - 3a

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