Precalculus Examples

$[\begin{array}{c} 2 & 3 \\ 2 & 5 \end{array}]$

Step 1

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

$2 \cdot 5 - 2 \cdot 3$

Step 2

Simplify the determinant.

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Step 2.1

Simplify each term.

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Step 2.1.1

Multiply $2$ by $5$ .

$10 - 2 \cdot 3$

Step 2.1.2

Multiply $- 2$ by $3$ .

$10 - 6$

Step 2.2

Subtract $6$ from $10$ .

$4$