If A=[31−12], show that A2−5A+7I=0. Hence, find A−1 – InterviewSolution

1.	If A=[31−12], show that A2−5A+7I=0. Hence, find A−1
Answer» If $A = [\begin{matrix} 3 & 1 - 1 & 2 \end{matrix}]$ , show that $A^{2} - 5 A + 7 I = 0$ . Hence, find $A^{- 1}$

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