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Railways Sample Paper RRB (Group D) Sample Test Paper-15

  • question_answer
    If\[\text{(}x\text{ }-\,3\text{)}\,\,(2x\text{ }+1)=0,\] then the possible values of \[2x\text{ }+1\] are:

    A)  0 only             

    B)         0 and 3

    C)  \[-\,\frac{1}{2}\] and 3 

    D)  0 and 7

    Correct Answer: D

    Solution :

    [d] \[(x-\,3)\,\,(2x+1)=0\] \[\Rightarrow (x-\,3)=0\,\,or\,\,(2x+1)=0\] \[when\,\,x-\,3=0\,\,then\,\,x=3\] \[when\,\,2x+1=0\,\,then\,\,x=-\,\frac{1}{2}\] If x=3, then (2x+1) =7 And 2x+1=0 When x=\[-\,\frac{1}{2}\] Possible value of (2x + 1) are 0 and 7.


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