Multiple Choice Questions on Expand w ndash 9 2 ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

Expand w ndash 9 2 ........

Quantitative Aptitude (RRB NTPC) Algebra
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    Expand : (w – 9)2

    (w2 – 9w + 81)

    Incorrect Answer

    (w2 – 9w + 18)

    Incorrect Answer

    (w2 – 18w + 81)

    Correct Answer

    (w2 – 18w – 81)

    Incorrect Answer
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    Explanation:

    (w – 9)2 = (w2 – 2×9×w + 81)
    = (w2 – 18w + 81)

    By: Barka Mirza
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