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      Question

      Find ‘x’ if (x³+3x)/(3x²+1) =

      189/61
      A 7 Correct Answer Incorrect Answer
      B 9 Correct Answer Incorrect Answer
      C 2 Correct Answer Incorrect Answer
      D 5 Correct Answer Incorrect Answer

      Solution

      Applying componendo and dividend (x³+3x+3x²+1)/(x³+3-3x²-1) = (189+61)/(189-61) ⇒ ((x+1)³)/((x-1)³) = 125/64  ⇒ (x+1)/(x-1) = 5/4  ⇒ x/1 = (5+4)/(5-4)  ⇒ 9

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