Answer :


We need to find A2 – 5A + 4I.

We know A2 = A × A.

Now, we evaluate –5A = –5 × A.

Finally, matrix 4I = 4 × I.

The given expression is A2 – 5A + 4I.

Given that A2 – 5A + 4I + X = O

X = – (A2 – 5A + 4I)

Thus, and

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