Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Linear Algebra Eigenvalues

Let \(A=\left[\begin{array}{rrr}1 & 0 & 2 \\ 1 & -2 & 0 \\ 0 & 0 & -3\end{array}\right]\) and I be the 3 × 3 identity matrix. If 6A-1 = aA2 + bA + cI for a, b, c ∈ ℝ then (a, b, c) equals

1
(1, 2, 1)
2
(1, -1, 2) 
3
(4, 1, 1) 
4
(1, 4, 1)
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