Question: [1 2 21 If A= 2 1 2 show that A? - 4A 51 = 0, where I,0 are the unit matrix and the

[1 2 21 If A= 2 1 2 show that A? -

[1 2 21 If A= 2 1 2 show that A? - 4A 51 = 0, where I,0 are the unit matrix and the null matrix of l2 2 1l order 3 respectively. Use this result to find A-1.

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