Matrix

Find the determinant of the following 2 x 2 matrix:

Hint
Hint 2
$$$\begin{bmatrix}a_{1} & a_2\\ b_1 & b_2\end{bmatrix}=(a_{1})(b_2)-(a_2)(b_1)$$$
$$$\begin{bmatrix}a_{1} & a_2\\ b_1 & b_2\end{bmatrix}=(a_{1})(b_2)-(a_2)(b_1)$$$
$$$\begin{bmatrix}1 & 2\\ 3 & 4\end{bmatrix}=(1)(4)-(2)(3)=4-6=-2$$$
-2