Subject

    Bank Exam

    Topic

    Pubali Bank Ltd. Junior Officer 2012

    If (x -1)2= 400, which of the following could b the value of x-5 ?

    ক)
    15
    খ)
    14
    গ)
    -24
    ঘ)
    -25

    Explanation

    (x -1)2 = 400 or, (x -1)2 = (20)2 or, (x -1) = (+-)20 or, x = (+-)20 + 1 = +21 or -19 Now, x - 5 = +21 - 5 (Taking the positive value) = +16 or, x - 5 = -19 - 5 = -24

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