Evaluate `|[2,4],[-1,2]|`

Explanation

To evaluate the determinant of the matrix \(\begin{bmatrix} 2 & 4 \\ -1 & 2 \end{bmatrix}\), we can follow these steps:

1. **Identify the elements of the matrix**:
The matrix is given as:
\[ A = \begin{bmatrix} 2 & 4 \\ -1 & 2 \end{bmatrix} \]
Here, we have:
...