Algebra Examples

$[\begin{array}{c} - 7 & - 6 \\ b & a \end{array}]$

Step 1

The determinant of a $2 \times 2$ matrix can be found using the formula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$- 7 a - b \cdot - 6$

Step 2

Multiply $- 6$ by $- 1$ .

$- 7 a + 6 b$