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A = \left[ \begin{array} { c c } { 3 } & { 1 } \\ { - 1 } & { 2 } \end{array} \right] , \text { verify that } A ^ { 2 } - 5 A + 7 | = 0 |
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Answer» plz keep options plz keep options plz keep options A^2=A*A=9-1 3+2 = 8 5 -3-2 -1+4 -5 3A^2-5A+7I=8-15+7 5-5+0 =0 0 -5+5+0 3-10+7 0 0Hence Proved. |
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