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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

यदि आव्यूह \(A =\left(\begin{array}{cc}0 & 2 \\ K & -1\end{array}\right)\), समीकरण \(A \left( A ^{3}+3 I \right)=2 I\) को संतुष्ट करता है, तो \(K\) का मान है

  1. A \(\frac{1}{2}\)
  2. B \(-\frac{1}{2}\)
  3. C \(-1\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac{1}{2}\)

Step-by-step Solution

Detailed explanation

Given matrix \(A=\left[\begin{array}{cc}0 & 2 \\ k & -1\end{array}\right]\) \(A^{4}+3 I A=2 I\) \(\Rightarrow A^{4}=2 I-3 A\) Also characteristic equation of \(\mathrm{A}\) is \(|\mathrm{A}-\lambda \mathrm{I}|=0\)…
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