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SSC Sample Paper SSC CGL - Sample Paper-5

  • question_answer
    \[{{(a+b+c)}^{2}}-{{(a-b-c)}^{2}}=?\]

    A)  \[4a(b+c)\]

    B)  \[2a(b+c)\]

    C)  \[3a(b+c)\]                   

    D)  \[4a(b-c)\]

    Correct Answer: A

    Solution :

    \[{{(a+b+c)}^{2}}-{{(a-b-c)}^{2}}\] \[=(a+b+c+a-b-c)(a+b+c-a+b+c)\]\[=2a\,(2b+2c)=4a\,(b+c)\]              


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