CUET · MATHS · PYQ PAPER 2025
If is equal to \(A=\left[\begin{array}{cc}3 & 1 \\ -1 & 2\end{array}\right]\), then \(A^2-5 A\) (where I is identity matrix of order 2)
- A \(14 I\)
- B \(7 I\)
- C \(-7 I\)
- D \(-5 I\)
Answer & Solution
Correct Answer
(C) \(-7 I\)
Step-by-step Solution
Detailed explanation
\(A^2 = \left[\begin{array}{cc}3 & 1 \\ -1 & 2\end{array}\right]\left[\begin{array}{cc}3 & 1 \\ -1 & 2\end{array}\right] = \left[\begin{array}{cc}8 & 5 \\ -5 & 3\end{array}\right]\)…
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