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SSC Sample Paper SSC CGL - Sample Paper-13

  • question_answer
    If x + y = 12 and xy = 32, then \[{{x}^{2}}+{{y}^{2}}=?\]

    A) 75                                

    B) 80

    C) 85                                

    D) 90

    Correct Answer: B

    Solution :

    \[{{(x+y)}^{2}}={{x}^{2}}+{{y}^{2}}+2xy\] \[\Rightarrow \]   \[{{12}^{2}}={{x}^{2}}+{{y}^{2}}+64\] \[\Rightarrow \]   \[{{x}^{2}}+{{y}^{2}}=144-64=80\]


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