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12th Class Mathematics Sample Paper Maths Olympiad Model Test Paper-11

  • question_answer
    If \[A=\left[ \begin{matrix}    3 & 1  \\    -1 & 2  \\ \end{matrix} \right],\]  then_________.

    A)  \[{{A}^{2}}+5A-7I=O\]         

    B)  \[{{A}^{2}}-5A+7I=O\]

    C)  \[{{A}^{2}}+7A-5I=O\]         

    D)  \[{{A}^{2}}-7A+5I=O\]

    E)  None of these

    Correct Answer: B

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