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    • Question

      If (x - y) = 1, then find the value of (x³ - y³ -

      3xy).
      A 2 Correct Answer Incorrect Answer
      C 1 Correct Answer Incorrect Answer
      D 3 Correct Answer Incorrect Answer

      Solution

      We know that,
      (x - y) ³ = x³ - y³ - 3xy(x - y)
      Given, (x - y) = 1
      ⇒ (x - y) ³ = 1³ = 1
      ⇒ x³ - y³ - 3xy × 1 = 1
      ⇒ x³ - y³ - 3xy = 1

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