Multiple Choice Questions on a b 11 ab 18 Simplify the following equation and find it 39 s value a b 2 a b 2 ........ for CDS Exam Preparation

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Multiple Choice Questions

a b 11 ab 18 Simplify the following equation and find it 39 s value a b 2 a b 2 ........

Quantitative Aptitude (CDS) Simplification
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    a+b=11, ab=18,Simplify the following equation and find it's value (a+b) ^2  -(a-b) ^2 ?

    23

    Correct Answer

    32

    Incorrect Answer

    30

    Incorrect Answer

    22

    Incorrect Answer
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    Explanation:

    (a+b) ^2  -(a-b) ^2
    (a+b) ^2 -{(a+b) ^2   -4ab}
    =(11) ^2   -{(11) ^2  -4×18}
    =121-(121-72) 
    =121-49
    =23

    By: bhavesh kumar singh
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