If A = $\begin{bmatrix} 3 & 0 \ 5 & 1 \end{bmatrix}$ and B = $\begin{bmatrix} -4 & 2 \ 1 & 0 \end{bmatrix}$, find A² – 2AB + B².

The order of the matrix having x rows and y columns is denoted by:

1. x + y

2. x - y

3. x × y

4. none of these

The matrix, A = $\begin{bmatrix} 3 & 4 & -8 \ 2 & 0 & -2 \ 1 & 7 & -9 \end{bmatrix}$, then the value of a₂₃ is:

1. 2

2. -8

3. -9

4. -2

The matrix, A = $\begin{bmatrix} 4 & 0 & 0 \ 0 & 3 & 0 \ 0 & 0 & -7 \end{bmatrix}$ is a:

1. Rectangular matrix

2. Column matrix

3. Diagonal matrix

4. Identity matrix