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      Question

      Find the value of (x + y)² - (x - y)², where x = 15

      and y = 7.
      A 264 Correct Answer Incorrect Answer
      B 440 Correct Answer Incorrect Answer
      C 420 Correct Answer Incorrect Answer
      D 504 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Using the algebraic formula: (x + y)² - (x - y)² = 4xy Substituting values: 4 * 15 * 7 = 420 Correct Answer: c)

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