Ejemplos

$[\begin{array}{c} 0 & 1 & 2 \\ 1 & 1 & 0 \\ 1 & 1 & 0 \end{array}]$

Paso 1

Choose the row or column with the most $0$ elements. If there are no $0$ elements choose any row or column. Multiply every element in column $3$ by its cofactor and add.

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Paso 1.1

Consider the corresponding sign chart.

$| \begin{array}{c} + & - & + \\ - & + & - \\ + & - & + \end{array} |$

Paso 1.2

The cofactor is the minor with the sign changed if the indices match a $-$ position on the sign chart.

Paso 1.3

The minor for $a_{13}$ is the determinant with row $1$ and column $3$ deleted.

$| \begin{array}{c} 1 & 1 \\ 1 & 1 \end{array} |$

Paso 1.4

Multiply element $a_{13}$ by its cofactor.

$2 | \begin{array}{c} 1 & 1 \\ 1 & 1 \end{array} |$

Paso 1.5

The minor for $a_{23}$ is the determinant with row $2$ and column $3$ deleted.

$| \begin{array}{c} 0 & 1 \\ 1 & 1 \end{array} |$

Paso 1.6

Multiply element $a_{23}$ by its cofactor.

$0 | \begin{array}{c} 0 & 1 \\ 1 & 1 \end{array} |$

Paso 1.7

The minor for $a_{33}$ is the determinant with row $3$ and column $3$ deleted.

$| \begin{array}{c} 0 & 1 \\ 1 & 1 \end{array} |$

Paso 1.8

Multiply element $a_{33}$ by its cofactor.

$0 | \begin{array}{c} 0 & 1 \\ 1 & 1 \end{array} |$

Paso 1.9

Add the terms together.

$2 | \begin{array}{c} 1 & 1 \\ 1 & 1 \end{array} | + 0 | \begin{array}{c} 0 & 1 \\ 1 & 1 \end{array} | + 0 | \begin{array}{c} 0 & 1 \\ 1 & 1 \end{array} |$

Paso 2

Multiplica $0$ por $| \begin{array}{c} 0 & 1 \\ 1 & 1 \end{array} |$ .

$2 | \begin{array}{c} 1 & 1 \\ 1 & 1 \end{array} | + 0 + 0 | \begin{array}{c} 0 & 1 \\ 1 & 1 \end{array} |$

Paso 3

Multiplica $0$ por $| \begin{array}{c} 0 & 1 \\ 1 & 1 \end{array} |$ .

$2 | \begin{array}{c} 1 & 1 \\ 1 & 1 \end{array} | + 0 + 0$

Paso 4

Evalúa $| \begin{array}{c} 1 & 1 \\ 1 & 1 \end{array} |$ .

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Paso 4.1

El determinante de una matriz $2 \times 2$ puede obtenerse usando la fórmula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$2 (1 \cdot 1 - 1 \cdot 1) + 0 + 0$

Paso 4.2

Simplifica el determinante.

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Paso 4.2.1

Simplifica cada término.

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Paso 4.2.1.1

Multiplica $1$ por $1$ .

$2 (1 - 1 \cdot 1) + 0 + 0$

Paso 4.2.1.2

Multiplica $- 1$ por $1$ .

$2 (1 - 1) + 0 + 0$

Paso 4.2.2

Resta $1$ de $1$ .

$2 \cdot 0 + 0 + 0$

Paso 5

Simplifica el determinante.

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Paso 5.1

Multiplica $2$ por $0$ .

$0 + 0 + 0$

Paso 5.2

Suma $0$ y $0$ .

$0 + 0$

Paso 5.3

Suma $0$ y $0$ .

$0$

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