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Discussion :: Surds and Indices

  1. If 2x-1+2x+1=320,then x is equal to

    2. A.
    6
    B.
    8
    C.
    5
    D.
    7

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    Answer : Option D

    Explanation :

    Aptitude Surds and Indices

    By equating the powers

    x-6 = 1
    x = 1+6 = 7

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