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Railways R.R.C. (Patna) Solved Paper Held on 1st Shift 2-11-2014

  • question_answer
    If one root of\[{{x}^{2}}-kx+5=0\] is 5, then the value of K is-

    A) \[-\frac{1}{2}\]                         

    B) \[-1\]

    C) 1                                 

    D) 2

    Correct Answer: C

    Solution :

    Put   \[x=5\]         Then,  \[{{(5)}^{2}}-6k\times 5+5=0\] \[25-30\,\,k+5=0\] \[30\,\,k=30\] \[k=1\]


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