Find λ such that A^4 = λA

Find λ such that A4 = λA

Given:

\[ A = \begin{bmatrix} 1 & 1 \\ 1 & 1 \end{bmatrix} \]

Step 1: Find A2

\[ A^2 = \begin{bmatrix} 1 & 1 \\ 1 & 1 \end{bmatrix} \begin{bmatrix} 1 & 1 \\ 1 & 1 \end{bmatrix} = \begin{bmatrix} 2 & 2 \\ 2 & 2 \end{bmatrix} = 2A \]

Step 2: Find A3

\[ A^3 = A \cdot A^2 = A \cdot (2A) = 2A^2 = 2(2A) = 4A \]

Step 3: Find A4

\[ A^4 = A \cdot A^3 = A \cdot (4A) = 4A^2 = 4(2A) = 8A \]

Step 4: Compare with λA

\[ A^4 = 8A = \lambda A \Rightarrow \lambda = 8 \]

Final Answer:

\[ \lambda = 8 \]

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