MCQ
यदि $A=\left[\begin{array}{cc}1 & 2 \\ -1 & -1\end{array}\right]$, तो $A^2-4 I_2=$
  • A
    $0$
  • B
    $I$
  • C
    $5 I_2$
  • $-5 I_2$

Answer

Correct option: D.
$-5 I_2$
D

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