Álgebra Exemplos

[\begin{array}{c} 2 & 0 \\ 3 & 1 \end{array}]

$[\begin{array}{c} 2 & 0 \\ 3 & 1 \end{array}]$

Etapa 1

The inverse of a

2 \times 2

$2 \times 2$ matrix can be found using the formula

\frac{1}{a d - b c} [\begin{array}{c} d & - b \\ - c & a \end{array}]

$\frac{1}{a d - b c} [\begin{array}{c} d & - b \\ - c & a \end{array}]$ where

a d - b c

$a d - b c$ is the determinant.

Etapa 2

Find the determinant.

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Etapa 2.1

O determinante de uma matriz

2 \times 2

$2 \times 2$ pode ser encontrado ao usar a fórmula

| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b

$| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

2 \cdot 1 - 3 \cdot 0

$2 \cdot 1 - 3 \cdot 0$

Etapa 2.2

Simplifique o determinante.

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Etapa 2.2.1

Simplifique cada termo.

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Etapa 2.2.1.1

Multiplique

2

$2$ por

1

$1$ .

2 - 3 \cdot 0

$2 - 3 \cdot 0$

Etapa 2.2.1.2

Multiplique

- 3

$- 3$ por

0

$0$ .

2 + 0

$2 + 0$

2 + 0

$2 + 0$

Etapa 2.2.2

Some

2

$2$ e

0

$0$ .

2

$2$

2

$2$

2

$2$

Etapa 3

Since the determinant is non-zero, the inverse exists.

Etapa 4

Substitute the known values into the formula for the inverse.

\frac{1}{2} [\begin{array}{c} 1 & 0 \\ - 3 & 2 \end{array}]

$\frac{1}{2} [\begin{array}{c} 1 & 0 \\ - 3 & 2 \end{array}]$

Etapa 5

Multiplique

\frac{1}{2}

$\frac{1}{2}$ por cada elemento da matriz.

[\begin{array}{c} \frac{1}{2} \cdot 1 & \frac{1}{2} \cdot 0 \\ \frac{1}{2} \cdot - 3 & \frac{1}{2} \cdot 2 \end{array}]

$[\begin{array}{c} \frac{1}{2} \cdot 1 & \frac{1}{2} \cdot 0 \\ \frac{1}{2} \cdot - 3 & \frac{1}{2} \cdot 2 \end{array}]$

Etapa 6

Simplifique cada elemento da matriz.

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Etapa 6.1

Multiplique

\frac{1}{2}

$\frac{1}{2}$ por

1

$1$ .

[\begin{array}{c} \frac{1}{2} & \frac{1}{2} \cdot 0 \\ \frac{1}{2} \cdot - 3 & \frac{1}{2} \cdot 2 \end{array}]

$[\begin{array}{c} \frac{1}{2} & \frac{1}{2} \cdot 0 \\ \frac{1}{2} \cdot - 3 & \frac{1}{2} \cdot 2 \end{array}]$

Etapa 6.2

Multiplique

\frac{1}{2}

$\frac{1}{2}$ por

0

$0$ .

[\begin{array}{c} \frac{1}{2} & 0 \\ \frac{1}{2} \cdot - 3 & \frac{1}{2} \cdot 2 \end{array}]

$[\begin{array}{c} \frac{1}{2} & 0 \\ \frac{1}{2} \cdot - 3 & \frac{1}{2} \cdot 2 \end{array}]$

Etapa 6.3

Combine

\frac{1}{2}

$\frac{1}{2}$ e

- 3

$- 3$ .

[\begin{array}{c} \frac{1}{2} & 0 \\ \frac{- 3}{2} & \frac{1}{2} \cdot 2 \end{array}]

$[\begin{array}{c} \frac{1}{2} & 0 \\ \frac{- 3}{2} & \frac{1}{2} \cdot 2 \end{array}]$

Etapa 6.4

Mova o número negativo para a frente da fração.

[\begin{array}{c} \frac{1}{2} & 0 \\ - \frac{3}{2} & \frac{1}{2} \cdot 2 \end{array}]

$[\begin{array}{c} \frac{1}{2} & 0 \\ - \frac{3}{2} & \frac{1}{2} \cdot 2 \end{array}]$

Etapa 6.5

Cancele o fator comum de

2

$2$ .

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Etapa 6.5.1

Cancele o fator comum.

[\begin{array}{c} \frac{1}{2} & 0 \\ - \frac{3}{2} & \frac{1}{2} \cdot 2 \end{array}]

$[\begin{array}{c} \frac{1}{2} & 0 \\ - \frac{3}{2} & \frac{1}{2} \cdot 2 \end{array}]$

Etapa 6.5.2

Reescreva a expressão.

[\begin{array}{c} \frac{1}{2} & 0 \\ - \frac{3}{2} & 1 \end{array}]

$[\begin{array}{c} \frac{1}{2} & 0 \\ - \frac{3}{2} & 1 \end{array}]$

[\begin{array}{c} \frac{1}{2} & 0 \\ - \frac{3}{2} & 1 \end{array}]

$[\begin{array}{c} \frac{1}{2} & 0 \\ - \frac{3}{2} & 1 \end{array}]$

[\begin{array}{c} \frac{1}{2} & 0 \\ - \frac{3}{2} & 1 \end{array}]

$[\begin{array}{c} \frac{1}{2} & 0 \\ - \frac{3}{2} & 1 \end{array}]$

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