Multiple Choice Questions on 2 radic 392 ndash 21 radic 8 7 2 2 ........ for Mathematics - All Exams Preparation

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Multiple Choice Questions

2 radic 392 ndash 21 radic 8 7 2 2 ........

Quantitative Aptitude ( CCS) Simplification
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    [2√392 – 21] + (√8-7)2 = ?2

    8

    Incorrect Answer

    6

    Correct Answer

    9

    Incorrect Answer

    11

    Incorrect Answer
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    Explanation:

    [2√392 – 21] + (√8-7)2 = x2
    [2 √49*8 -21] + 8+ 49 -14√8= x2
    14√8 -21 +57 -14√8= x2
    x2=36
    x=6.

    Hence, option 2 is the correct answer.

    By: Amit Kumar
    ProfileResources

    Let's Discuss

    Parul Aggarwal

    mam please clearly mention the under root's sign, as it leads to misconception of underroot over the whole figure

    0 0 reply
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