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    • Question

      If (x 2 = 6x – 9), then find the value of

      [x³ + (x⁴/9)][5 - x³]
      A -792 Correct Answer Incorrect Answer
      B -702 Correct Answer Incorrect Answer
      C -882 Correct Answer Incorrect Answer
      D -762 Correct Answer Incorrect Answer

      Solution

      x² = 6x - 9
      ⇒ x² - 6x + 9 = 0
      ⇒ (x - 3)² = 0
      ⇒ x = 3

      Required value = [3³ + (3⁴/9)] × [5 - 3³]
      = [27 + (81/9)] × [5 - 27]
      = (27 + 9) × (-22)
      = 36 × (-22) = -792

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