Railways R.R.C. (Gorakhpur) Solved Paper Held on 1st Shift 23-11-2014

  • question_answer
    What is the value of \[({{x}^{4}}-16)\,\,(x-2)?\]

    A) \[{{x}^{3}}+2{{x}^{2}}+4x+8\]     

    B) \[{{x}^{3}}+4{{x}^{2}}+2x+8\]

    C) \[{{x}^{3}}-2{{x}^{2}}+4x-8\]  

    D) \[{{x}^{3}}+4{{x}^{2}}-2x-8\]

    Correct Answer: A

    Solution :

    \[\frac{{{x}^{4}}-16}{x-2}=\frac{({{x}^{2}}-4)\,\,({{x}^{2}}+4)}{(x-2)}\] \[=\frac{({{x}^{2}}-4)\,\,({{x}^{2}}+4)}{(x-2)}\] \[=(x+2)\,\,({{x}^{2}}+4)\] \[={{x}^{3}}+2{{x}^{2}}+4x+8\]


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