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    • Question

      If (x 2 = 12x – 36), then find the value of

      [x³ + (x⁴/36)][6 - x³]
      A -52920 Correct Answer Incorrect Answer
      B -51840 Correct Answer Incorrect Answer
      C -54000 Correct Answer Incorrect Answer
      D -51200 Correct Answer Incorrect Answer

      Solution

      x² = 12x - 36
      ⇒ x² - 12x + 36 = 0
      ⇒ (x - 6)² = 0
      ⇒ x = 6
      Required value = [6³ + (6⁴/36)] × [6 - 6³]
      = (216 + 36) × (-210)
      = 252 × (-210) = -52920

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