CUET · MATHS · PYQ PAPER 2023
If \(A=\left[\begin{array}{cc}2 & 3 \\ -1 & 1\end{array}\right]\) and \(A^2-3 A+k I=0\), then the value of \(k\) is:
- A -5
- B 3
- C 5
- D -3
Answer & Solution
Correct Answer
(C) 5
Step-by-step Solution
Detailed explanation
\( Tr(A) = 2+1 = 3 \) \( \det(A) = (2)(1) - (3)(-1) = 2+3 = 5 \) \( A^2 - Tr(A)A + \det(A)I = 0 \) \( A^2 - 3A + 5I = 0 \) \( k=5 \)
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