10th Class Mathematics Related to Competitive Exam Question Bank Algebra

  • question_answer
    Consider the following statements : 1. \[X-2\]is a factor of \[{{X}^{3}}-3{{X}^{2}}+4X-4\] 2.\[X+1\]is a factor of \[2{{X}^{3}}+4X+6\] 3. \[X-1\] is a factor of\[{{X}^{6}}-{{X}^{5}}+{{X}^{4}}-{{X}^{3}}+{{X}^{2}}-X+1\] Of these statements

    A)  1 and 2 are correct  

    B)  1, 2 and 3 are correct

    C)  2 and 3 are correct

    D)  1 and 3 are correct

    Correct Answer: A

    Solution :

     1. Remainder\[={{2}^{3}}-{{3.2}^{2}}+4\times 2-4\]                                 \[=8-12+8-4=0\]. Hence \[x-2\] is a factor. 2. Remainder \[=2{{(-1)}^{3}}+4(-1)+6\]                          \[=-2-4+6=0\] Hence\[x+1\]is a factor. 3. Remainder\[={{1}^{6}}-{{1}^{5}}+{{1}^{5}}-{{1}^{3}}+{{1}^{2}}-1+1=1\]. Hence \[x-1\] is not a factor. \[\therefore \]Statements 1 and 2 are correct.


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