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9th Class Mathematics Polynomials Question Bank Polynomials

  • question_answer
    If\[({{x}^{2}}+3x+5)({{x}^{2}}-3x+5)={{m}^{2}}-{{n}^{2}}\], find\[m\].

    A) \[{{x}^{2}}-3x\]                     

    B) \[3x+5\]           

    C)        \[{{x}^{2}}+5\]         

    D)        \[{{x}^{2}}-5\]                       

    Correct Answer: C

    Solution :

    \[({{x}^{2}}+3x+5)({{x}^{2}}-3x+5)\] \[={{({{x}^{2}}+5)}^{2}}-{{(3x)}^{2}}\] \[\therefore \]\[m={{x}^{2}}+5\]


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