Matrices
RS Aggarwal
CBSE
Grade 12
Question:
If $A = \begin{bmatrix} 1 & 2 & 2 \\ 2 & 1 & 2 \\ 2 & 2 & 1 \end{bmatrix}$, prove that $A^2 - 4A - 5I = O$.
Step-by-Step Solution
Key Concept: Compute A^2, 4A, 5I and verify.
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Correct Answer:
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