2x2 Matrix
Find the determinant of the shown 2 x 2 matrix:
Expand Hint
Hint 2
$$$\begin{bmatrix}a_{1} & a_2\\ b_1 & b_2\end{bmatrix}=(a_{1})(b_2)-(a_2)(b_1)$$$
$$$\begin{bmatrix}a_{1} & a_2\\ b_1 & b_2\end{bmatrix}=(a_{1})(b_2)-(a_2)(b_1)$$$
$$$\begin{bmatrix}3 & 8\\ 10 & 4\end{bmatrix}=(3)(4)-(8)(10)=12-80=-68$$$
-68
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