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  1. 107 x 107 + 93 x 93 = ?

    2. A.

    19578
    B.

    19418
    C.

    20098
    D.

    21908
    E.

    None of these

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    Answer : Option C

    Explanation :

    107 x 107 + 93 x 93    = (107)2 + (93)2
    = (100 + 7)2 + (100 - 7)2
    = 2 x [(100)2 + 72]       [Ref: (a + b)2 + (a - b)2 = 2(a2 + b2)]
    = 20098

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