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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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