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    Question

    ((99.9 - 20.9)² + (99.9 + 20.9)

    >² )/(99.9 x 99.9 + 20.9 x 20.9) = ?
    A 2 Correct Answer Incorrect Answer
    B 3 Correct Answer Incorrect Answer
    C 6 Correct Answer Incorrect Answer
    D 4 Correct Answer Incorrect Answer

    Solution

    Let a = 99.9 & b = 20.9 then, ((99.9 - 20.9)² + (99.9 + 20.9)²)/(99.9 x 99.9 + 20.9 x 20.9) = ? = ((a - b) 2 + (a + b) 2)/(a x a + b x b) = 2 x (a 2 + b 2)/(a 2 +b 2) = 2 ` `

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