Let A=[122212221] . Then A2−4A−5I3=O b. A−1=51(A−4I3) c. A3 is not invertible d. A2 is invertible

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Let {A}={[{1}{2}{2}{2}{1}{2}{2}{2}{1}]} . Then {A}^{{2}}-{4}{A

Question

Let $A = [122212221]$ . Then $A^{2} - 4 A - 5 I_{3} = O$ b. $A^{- 1} = \frac{1}{5} (A - 4 I_{3})$ c. $A^{3}$ is not invertible d. $A^{2}$ is invertible

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Scarlett Discussed

Let

A = [122212221]

. Then

A^{2} - 4 A - 5 I_{3} = O

A^{- 1} = \frac{1}{5} (A - 4 I_{3})

A^{3}

is not invertible d.

A^{2}

is invertible

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Question Text

Let

A = [122212221]

. Then

A^{2} - 4 A - 5 I_{3} = O

A^{- 1} = \frac{1}{5} (A - 4 I_{3})

A^{3}

is not invertible d.

A^{2}

is invertible