Finite Math Examples

$[\begin{array}{c} 1 & 2 \\ - 2 & - 1 \end{array}]$

Step 1

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

$1 \cdot - 1 - (- 2 \cdot 2)$

Step 2

Simplify the determinant.

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Step 2.1

Simplify each term.

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Step 2.1.1

Multiply $- 1$ by $1$ .

$- 1 - (- 2 \cdot 2)$

Step 2.1.2

Multiply $- (- 2 \cdot 2)$ .

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Step 2.1.2.1

Multiply $- 2$ by $2$ .

$- 1 - - 4$

Step 2.1.2.2

Multiply $- 1$ by $- 4$ .

$- 1 + 4$

Step 2.2

Add $- 1$ and $4$ .

$3$

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