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8th Class Mathematics Playing with Numbers Question Bank Playing with Numbers

  • question_answer
    \[{{x}^{2}}+x+11\]is a prime number. Which of the following is not a value of 'x'?

    A)  \[1\]                                    

    B)  \[3\]    

    C)         \[4\]    

    D)         \[2\]

    Correct Answer: B

    Solution :

    For \[x=3,\] \[{{x}^{2}}+x+11=9+3+11\]\[=33\]= 33 is not a prime number.


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