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Discussion :: Decimal Fraction

  1. What is the value of (25.732)2 - (15.732)2?

    2. A.
    414.64
    B.
    414.256
    C.
    414.128
    D.
    414.52

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    Answer : Option A

    Explanation :

    We know that, a2 - b2 = (a+b) (a - b)

    Or, (25.732)2 - (15.732)2 = (25.732 + 15.732) (25.732 - 15.732)

    Or, the value = 41.464 * 10 = 414.64

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