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Matrices — Mathematics STD 10 — Question

ICSE BoardEnglish MediumSTD 10MathematicsMatrices4 Marks
Question
Given $A =\left[\begin{array}{cc}2 & 0 \\ -1 & 7\end{array}\right], I =\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]$ and $A ^2=9 A+m I$. Find $m$.
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Answer

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