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$[\begin{array}{c} 4 & - 7 & 4 \\ 0 & - 3 & 4 \\ 0 & - 8 & 9 \end{array}] - [\begin{array}{c} 4 & 0 & 0 \\ 0 & 4 & 0 \\ 0 & 0 & 4 \end{array}]$

خطوة 1

اطرح العناصر المتناظرة.

$[\begin{array}{c} 4 - 4 & - 7 - 0 & 4 - 0 \\ 0 - 0 & - 3 - 4 & 4 - 0 \\ 0 - 0 & - 8 - 0 & 9 - 4 \end{array}]$

خطوة 2

Simplify each element.

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خطوة 2.1

اطرح $4$ من $4$ .

$[\begin{array}{c} 0 & - 7 - 0 & 4 - 0 \\ 0 - 0 & - 3 - 4 & 4 - 0 \\ 0 - 0 & - 8 - 0 & 9 - 4 \end{array}]$

خطوة 2.2

اطرح $0$ من $- 7$ .

$[\begin{array}{c} 0 & - 7 & 4 - 0 \\ 0 - 0 & - 3 - 4 & 4 - 0 \\ 0 - 0 & - 8 - 0 & 9 - 4 \end{array}]$

خطوة 2.3

اطرح $0$ من $4$ .

$[\begin{array}{c} 0 & - 7 & 4 \\ 0 - 0 & - 3 - 4 & 4 - 0 \\ 0 - 0 & - 8 - 0 & 9 - 4 \end{array}]$

خطوة 2.4

اطرح $0$ من $0$ .

$[\begin{array}{c} 0 & - 7 & 4 \\ 0 & - 3 - 4 & 4 - 0 \\ 0 - 0 & - 8 - 0 & 9 - 4 \end{array}]$

خطوة 2.5

اطرح $4$ من $- 3$ .

$[\begin{array}{c} 0 & - 7 & 4 \\ 0 & - 7 & 4 - 0 \\ 0 - 0 & - 8 - 0 & 9 - 4 \end{array}]$

خطوة 2.6

اطرح $0$ من $4$ .

$[\begin{array}{c} 0 & - 7 & 4 \\ 0 & - 7 & 4 \\ 0 - 0 & - 8 - 0 & 9 - 4 \end{array}]$

خطوة 2.7

اطرح $0$ من $0$ .

$[\begin{array}{c} 0 & - 7 & 4 \\ 0 & - 7 & 4 \\ 0 & - 8 - 0 & 9 - 4 \end{array}]$

خطوة 2.8

اطرح $0$ من $- 8$ .

$[\begin{array}{c} 0 & - 7 & 4 \\ 0 & - 7 & 4 \\ 0 & - 8 & 9 - 4 \end{array}]$

خطوة 2.9

اطرح $4$ من $9$ .

$[\begin{array}{c} 0 & - 7 & 4 \\ 0 & - 7 & 4 \\ 0 & - 8 & 5 \end{array}]$

خطوة 3

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 $1$ by its cofactor and add.

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خطوة 3.1

Consider the corresponding sign chart.

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

خطوة 3.2

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

خطوة 3.3

The minor for $a_{11}$ is the determinant with row $1$ and column $1$ deleted.

$| \begin{array}{c} - 7 & 4 \\ - 8 & 5 \end{array} |$

خطوة 3.4

Multiply element $a_{11}$ by its cofactor.

$0 | \begin{array}{c} - 7 & 4 \\ - 8 & 5 \end{array} |$

خطوة 3.5

The minor for $a_{21}$ is the determinant with row $2$ and column $1$ deleted.

$| \begin{array}{c} - 7 & 4 \\ - 8 & 5 \end{array} |$

خطوة 3.6

Multiply element $a_{21}$ by its cofactor.

$0 | \begin{array}{c} - 7 & 4 \\ - 8 & 5 \end{array} |$

خطوة 3.7

The minor for $a_{31}$ is the determinant with row $3$ and column $1$ deleted.

$| \begin{array}{c} - 7 & 4 \\ - 7 & 4 \end{array} |$

خطوة 3.8

Multiply element $a_{31}$ by its cofactor.

$0 | \begin{array}{c} - 7 & 4 \\ - 7 & 4 \end{array} |$

خطوة 3.9

Add the terms together.

$0 | \begin{array}{c} - 7 & 4 \\ - 8 & 5 \end{array} | + 0 | \begin{array}{c} - 7 & 4 \\ - 8 & 5 \end{array} | + 0 | \begin{array}{c} - 7 & 4 \\ - 7 & 4 \end{array} |$

خطوة 4

اضرب $0$ في $| \begin{array}{c} - 7 & 4 \\ - 8 & 5 \end{array} |$ .

$0 + 0 | \begin{array}{c} - 7 & 4 \\ - 8 & 5 \end{array} | + 0 | \begin{array}{c} - 7 & 4 \\ - 7 & 4 \end{array} |$

خطوة 5

اضرب $0$ في $| \begin{array}{c} - 7 & 4 \\ - 8 & 5 \end{array} |$ .

$0 + 0 + 0 | \begin{array}{c} - 7 & 4 \\ - 7 & 4 \end{array} |$

خطوة 6

اضرب $0$ في $| \begin{array}{c} - 7 & 4 \\ - 7 & 4 \end{array} |$ .

$0 + 0 + 0$

خطوة 7

بسّط المحدد.

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خطوة 7.1

أضف $0$ و $0$ .

$0 + 0$

خطوة 7.2

أضف $0$ و $0$ .

$0$