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12th Class Mathematics Sample Paper Maths Olympiad Model Paper-5

  • question_answer
    If \[\left[ \begin{matrix}    x+1 & 3 & 5  \\    2 & x+2 & 5  \\    1 & 3 & x+4  \\ \end{matrix} \right]=0,\] then x=

    A)  \[1,\,\,9\]                                  

    B)  \[-1,\,\,9\]

    C)  \[-1,\,\,-9\]                    

    D)  \[1,\,\,-9\]

    E)  None of these

    Correct Answer: D

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