If A = $\begin{bmatrix$}[r] 4 & x \ 0 & 1 \end{bmatrix}, B = \begin{bmatrix}[r] 2 & 12 \ 0 & 1 \end{bmatrix} and A = B², the value of x is :

1. 38

2. -6

3. -36

4. 36

A, B and C are three square matrices each of order 3; the order of matrix CA + B² is :

1. 3 × 1

2. 3 × 3

3. 1 × 3

4. 2 × 3

If A = $\begin{bmatrix$}[r] 1 & 0 \ 1 & 1 \end{bmatrix}, B = \begin{bmatrix}[r] 0 & 1 \ 1 & 0 \end{bmatrix}\text{ and C} = \begin{bmatrix}[r] 1 & 1 \ 0 & 0 \end{bmatrix}, the matrix A² + 2B - 3C is :

1. $\begin{bmatrix$}[r] -2 & -1 \ 4 & 1 \end{bmatrix}

2. $\begin{bmatrix$}[r] 2 & -1 \ 4 & 1 \end{bmatrix}

3. $\begin{bmatrix$}[r] 2 & 1 \ 4 & 1 \end{bmatrix}

4. $\begin{bmatrix$}[r] 2 & 1 \ -4 & -1 \end{bmatrix}

Evaluate : if possible :

$\begin{bmatrix$}[r] 3 & 2 \ \end{bmatrix}\begin{bmatrix}[r] 2 \ 0 \end{bmatrix}