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    Question

    What approximate value will come in place of the question

    mark (?) in the following question? (Note: You are not expected to calculate the exact value.) (56.2² - 25.9²) = ?
    A 2155 Correct Answer Incorrect Answer
    B 2196 Correct Answer Incorrect Answer
    C 2460 Correct Answer Incorrect Answer
    D 2250 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Use a² - b² = (a + b)(a - b)

    56.2 + 25.9 = 82.1 ≈ 82

    56.2 - 25.9 = 30.3 ≈ 30

    ⇒ 82 × 30 = 2460

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