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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-11

  • question_answer
    lf\[(a-b)=4\]and\[a\times b=2,\]then\[({{a}^{2}}+{{b}^{2}})=?\]

    A)  20                   

    B)  18

    C)  25                   

    D)  None of these

    Correct Answer: A

    Solution :

    \[{{a}^{2}}+{{b}^{2}}={{(a-b)}^{2}}+2ab\] \[={{(4)}^{2}}+2\times 2=20\]


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