Multiple Choice Questions on If a b 2and a 2 b 2 29 find the value of ab ........ for CDS Exam Preparation

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Multiple Choice Questions

If a b 2and a 2 b 2 29 find the value of ab ........

Quantitative Aptitude (CDS) Simplification
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    If a-b=2and a^2 + b^2 =29,find the value of ab? 

    25

    Incorrect Answer

    36

    Incorrect Answer

    30/5

    Incorrect Answer


    25/2

    Correct Answer
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    Explanation:

    (a+b) ^2  = (a-b) ^2 + 4ab
    a^2 + b^2 +2ab = (2) ^2 + 4ab
    29-4  =2ab
    ab=25/2

    By: bhavesh kumar singh
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