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9th Class Mathematics Number System and its Operations Question Bank Number Systems

  • question_answer
    If\[x=\sqrt{5}+2\], find the value of\[x-\frac{1}{x}\].

    A) \[2\sqrt{5}\]                  

    B)        \[4\]                 

    C) \[2\]                 

    D)        \[\sqrt{5}\]        

    Correct Answer: B

    Solution :

    \[x=\sqrt{5}+2\Rightarrow \frac{1}{x}=\sqrt{5}-2\] \[x-\frac{1}{x}=\sqrt{5}+2-\sqrt{5}+2=4\]


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