If $A = \begin{bmatrix} 3 & 1 \\ -1 & 2 \end{bmatrix}$,then ${A^2} = $

  • A
    $\begin{bmatrix} 8 & -5 \\ -5 & 3 \end{bmatrix}$
  • B
    $\begin{bmatrix} 8 & -5 \\ 5 & 3 \end{bmatrix}$
  • C
    $\begin{bmatrix} 8 & -5 \\ -5 & -3 \end{bmatrix}$
  • D
    $\begin{bmatrix} 8 & 5 \\ -5 & 3 \end{bmatrix}$

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If $I$ is a unit matrix,then $3I$ will be

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