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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-12

  • question_answer
    The quantity which must be added to\[(1-x)\,(1+{{x}^{2}})\] to obtain \[{{x}^{3}}\] is:

    A)  \[2{{x}^{3}}+3{{x}^{2}}+x+1\]

    B)  \[2{{x}^{3}}+{{x}^{2}}+x-1\]

    C) \[2{{x}^{3}}-{{x}^{2}}+x-1\]

    D)  \[-{{x}^{2}}+x-1\]

    Correct Answer: C

    Solution :

     \[(1-x)\,\,(1+{{x}^{2}})=1-x+{{x}^{2}}-{{x}^{3}}\] So, \[\]must added to \[\left( 1-x+{{x}^{2}}-{{x}^{3}} \right)\] to obtain \[{{x}^{3}}\].


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