SSC SSC CHSL TIER-I Solved Paper Held on 10.01.2017

  • question_answer
    If \[16qxy={{(2x+y)}^{2}}-{{(2x-y)}^{2}},\] then what is the value of q?

    A)  0.5                              

    B)  0.25

    C)  4                    

    D)  2

    Correct Answer: A

    Solution :

     \[16qxy={{(2x+y)}^{2}}-{{(2x-y)}^{2}}\] \[\Rightarrow \]\[16qxy=4\times 2x\times y\] \[[\because \,{{(a+b)}^{2}}-{{(a-b)}^{2}}=4ab]\] \[\Rightarrow \]\[2q=1\] \[\Rightarrow \]\[q=\frac{1}{2}=0.5\]


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