Finite Math Examples

$0.5 [\begin{array}{c} 1 & 3 & 5 \\ 5 & 2 & - 1 \\ - 2 & 0 & 1 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1

Simplify each term.

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Step 1.1

Multiply $0.5$ by each element of the matrix.

$[\begin{array}{c} 0.5 \cdot 1 & 0.5 \cdot 3 & 0.5 \cdot 5 \\ 0.5 \cdot 5 & 0.5 \cdot 2 & 0.5 \cdot - 1 \\ 0.5 \cdot - 2 & 0.5 \cdot 0 & 0.5 \cdot 1 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.2

Simplify each element in the matrix.

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Step 1.2.1

Multiply $0.5$ by $1$ .

$[\begin{array}{c} 0.5 & 0.5 \cdot 3 & 0.5 \cdot 5 \\ 0.5 \cdot 5 & 0.5 \cdot 2 & 0.5 \cdot - 1 \\ 0.5 \cdot - 2 & 0.5 \cdot 0 & 0.5 \cdot 1 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.2.2

Multiply $0.5$ by $3$ .

$[\begin{array}{c} 0.5 & 1.5 & 0.5 \cdot 5 \\ 0.5 \cdot 5 & 0.5 \cdot 2 & 0.5 \cdot - 1 \\ 0.5 \cdot - 2 & 0.5 \cdot 0 & 0.5 \cdot 1 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.2.3

Multiply $0.5$ by $5$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 0.5 \cdot 5 & 0.5 \cdot 2 & 0.5 \cdot - 1 \\ 0.5 \cdot - 2 & 0.5 \cdot 0 & 0.5 \cdot 1 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.2.4

Multiply $0.5$ by $5$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 0.5 \cdot 2 & 0.5 \cdot - 1 \\ 0.5 \cdot - 2 & 0.5 \cdot 0 & 0.5 \cdot 1 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.2.5

Multiply $0.5$ by $2$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & 0.5 \cdot - 1 \\ 0.5 \cdot - 2 & 0.5 \cdot 0 & 0.5 \cdot 1 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.2.6

Multiply $0.5$ by $- 1$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ 0.5 \cdot - 2 & 0.5 \cdot 0 & 0.5 \cdot 1 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.2.7

Multiply $0.5$ by $- 2$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0.5 \cdot 0 & 0.5 \cdot 1 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.2.8

Multiply $0.5$ by $0$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \cdot 1 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.2.9

Multiply $0.5$ by $1$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] - 0.2 [\begin{array}{c} 2 & 3 & 4 \\ - 1 & 1 & - 4 \\ 3 & 5 & - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.3

Multiply $- 0.2$ by each element of the matrix.

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.2 \cdot 2 & - 0.2 \cdot 3 & - 0.2 \cdot 4 \\ - 0.2 \cdot - 1 & - 0.2 \cdot 1 & - 0.2 \cdot - 4 \\ - 0.2 \cdot 3 & - 0.2 \cdot 5 & - 0.2 \cdot - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.4

Simplify each element in the matrix.

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Step 1.4.1

Multiply $- 0.2$ by $2$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.2 \cdot 3 & - 0.2 \cdot 4 \\ - 0.2 \cdot - 1 & - 0.2 \cdot 1 & - 0.2 \cdot - 4 \\ - 0.2 \cdot 3 & - 0.2 \cdot 5 & - 0.2 \cdot - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.4.2

Multiply $- 0.2$ by $3$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.2 \cdot 4 \\ - 0.2 \cdot - 1 & - 0.2 \cdot 1 & - 0.2 \cdot - 4 \\ - 0.2 \cdot 3 & - 0.2 \cdot 5 & - 0.2 \cdot - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.4.3

Multiply $- 0.2$ by $4$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ - 0.2 \cdot - 1 & - 0.2 \cdot 1 & - 0.2 \cdot - 4 \\ - 0.2 \cdot 3 & - 0.2 \cdot 5 & - 0.2 \cdot - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.4.4

Multiply $- 0.2$ by $- 1$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 \cdot 1 & - 0.2 \cdot - 4 \\ - 0.2 \cdot 3 & - 0.2 \cdot 5 & - 0.2 \cdot - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.4.5

Multiply $- 0.2$ by $1$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & - 0.2 \cdot - 4 \\ - 0.2 \cdot 3 & - 0.2 \cdot 5 & - 0.2 \cdot - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.4.6

Multiply $- 0.2$ by $- 4$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.2 \cdot 3 & - 0.2 \cdot 5 & - 0.2 \cdot - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.4.7

Multiply $- 0.2$ by $3$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 0.2 \cdot 5 & - 0.2 \cdot - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.4.8

Multiply $- 0.2$ by $5$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & - 0.2 \cdot - 5 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.4.9

Multiply $- 0.2$ by $- 5$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + 0.6 [\begin{array}{c} 3 & 4 & - 1 \\ 4 & 5 & 1 \\ 1 & 0 & 0 \end{array}]$

Step 1.5

Multiply $0.6$ by each element of the matrix.

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + [\begin{array}{c} 0.6 \cdot 3 & 0.6 \cdot 4 & 0.6 \cdot - 1 \\ 0.6 \cdot 4 & 0.6 \cdot 5 & 0.6 \cdot 1 \\ 0.6 \cdot 1 & 0.6 \cdot 0 & 0.6 \cdot 0 \end{array}]$

Step 1.6

Simplify each element in the matrix.

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Step 1.6.1

Multiply $0.6$ by $3$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + [\begin{array}{c} 1.8 & 0.6 \cdot 4 & 0.6 \cdot - 1 \\ 0.6 \cdot 4 & 0.6 \cdot 5 & 0.6 \cdot 1 \\ 0.6 \cdot 1 & 0.6 \cdot 0 & 0.6 \cdot 0 \end{array}]$

Step 1.6.2

Multiply $0.6$ by $4$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & 0.6 \cdot - 1 \\ 0.6 \cdot 4 & 0.6 \cdot 5 & 0.6 \cdot 1 \\ 0.6 \cdot 1 & 0.6 \cdot 0 & 0.6 \cdot 0 \end{array}]$

Step 1.6.3

Multiply $0.6$ by $- 1$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 0.6 \cdot 4 & 0.6 \cdot 5 & 0.6 \cdot 1 \\ 0.6 \cdot 1 & 0.6 \cdot 0 & 0.6 \cdot 0 \end{array}]$

Step 1.6.4

Multiply $0.6$ by $4$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 0.6 \cdot 5 & 0.6 \cdot 1 \\ 0.6 \cdot 1 & 0.6 \cdot 0 & 0.6 \cdot 0 \end{array}]$

Step 1.6.5

Multiply $0.6$ by $5$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \cdot 1 \\ 0.6 \cdot 1 & 0.6 \cdot 0 & 0.6 \cdot 0 \end{array}]$

Step 1.6.6

Multiply $0.6$ by $1$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 \cdot 1 & 0.6 \cdot 0 & 0.6 \cdot 0 \end{array}]$

Step 1.6.7

Multiply $0.6$ by $1$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0.6 \cdot 0 & 0.6 \cdot 0 \end{array}]$

Step 1.6.8

Multiply $0.6$ by $0$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0.6 \cdot 0 \end{array}]$

Step 1.6.9

Multiply $0.6$ by $0$ .

$[\begin{array}{c} 0.5 & 1.5 & 2.5 \\ 2.5 & 1 & - 0.5 \\ - 1 & 0 & 0.5 \end{array}] + [\begin{array}{c} - 0.4 & - 0.6 & - 0.8 \\ 0.2 & - 0.2 & 0.8 \\ - 0.6 & - 1 & 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 2

Add the corresponding elements.

$[\begin{array}{c} 0.5 - 0.4 & 1.5 - 0.6 & 2.5 - 0.8 \\ 2.5 + 0.2 & 1 - 0.2 & - 0.5 + 0.8 \\ - 1 - 0.6 & 0 - 1 & 0.5 + 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 3

Simplify each element.

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Step 3.1

Subtract $0.4$ from $0.5$ .

$[\begin{array}{c} 0.1 & 1.5 - 0.6 & 2.5 - 0.8 \\ 2.5 + 0.2 & 1 - 0.2 & - 0.5 + 0.8 \\ - 1 - 0.6 & 0 - 1 & 0.5 + 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 3.2

Subtract $0.6$ from $1.5$ .

$[\begin{array}{c} 0.1 & 0.9 & 2.5 - 0.8 \\ 2.5 + 0.2 & 1 - 0.2 & - 0.5 + 0.8 \\ - 1 - 0.6 & 0 - 1 & 0.5 + 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 3.3

Subtract $0.8$ from $2.5$ .

$[\begin{array}{c} 0.1 & 0.9 & 1.7 \\ 2.5 + 0.2 & 1 - 0.2 & - 0.5 + 0.8 \\ - 1 - 0.6 & 0 - 1 & 0.5 + 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 3.4

Add $2.5$ and $0.2$ .

$[\begin{array}{c} 0.1 & 0.9 & 1.7 \\ 2.7 & 1 - 0.2 & - 0.5 + 0.8 \\ - 1 - 0.6 & 0 - 1 & 0.5 + 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 3.5

Subtract $0.2$ from $1$ .

$[\begin{array}{c} 0.1 & 0.9 & 1.7 \\ 2.7 & 0.8 & - 0.5 + 0.8 \\ - 1 - 0.6 & 0 - 1 & 0.5 + 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 3.6

Add $- 0.5$ and $0.8$ .

$[\begin{array}{c} 0.1 & 0.9 & 1.7 \\ 2.7 & 0.8 & 0.3 \\ - 1 - 0.6 & 0 - 1 & 0.5 + 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 3.7

Subtract $0.6$ from $- 1$ .

$[\begin{array}{c} 0.1 & 0.9 & 1.7 \\ 2.7 & 0.8 & 0.3 \\ - 1.6 & 0 - 1 & 0.5 + 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 3.8

Subtract $1$ from $0$ .

$[\begin{array}{c} 0.1 & 0.9 & 1.7 \\ 2.7 & 0.8 & 0.3 \\ - 1.6 & - 1 & 0.5 + 1 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 3.9

Add $0.5$ and $1$ .

$[\begin{array}{c} 0.1 & 0.9 & 1.7 \\ 2.7 & 0.8 & 0.3 \\ - 1.6 & - 1 & 1.5 \end{array}] + [\begin{array}{c} 1.8 & 2.4 & - 0.6 \\ 2.4 & 3 & 0.6 \\ 0.6 & 0 & 0 \end{array}]$

Step 4

Add the corresponding elements.

$[\begin{array}{c} 0.1 + 1.8 & 0.9 + 2.4 & 1.7 - 0.6 \\ 2.7 + 2.4 & 0.8 + 3 & 0.3 + 0.6 \\ - 1.6 + 0.6 & - 1 + 0 & 1.5 + 0 \end{array}]$

Step 5

Simplify each element.

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Step 5.1

Add $0.1$ and $1.8$ .

$[\begin{array}{c} 1.9 & 0.9 + 2.4 & 1.7 - 0.6 \\ 2.7 + 2.4 & 0.8 + 3 & 0.3 + 0.6 \\ - 1.6 + 0.6 & - 1 + 0 & 1.5 + 0 \end{array}]$

Step 5.2

Add $0.9$ and $2.4$ .

$[\begin{array}{c} 1.9 & 3.3 & 1.7 - 0.6 \\ 2.7 + 2.4 & 0.8 + 3 & 0.3 + 0.6 \\ - 1.6 + 0.6 & - 1 + 0 & 1.5 + 0 \end{array}]$

Step 5.3

Subtract $0.6$ from $1.7$ .

$[\begin{array}{c} 1.9 & 3.3 & 1.1 \\ 2.7 + 2.4 & 0.8 + 3 & 0.3 + 0.6 \\ - 1.6 + 0.6 & - 1 + 0 & 1.5 + 0 \end{array}]$

Step 5.4

Add $2.7$ and $2.4$ .

$[\begin{array}{c} 1.9 & 3.3 & 1.1 \\ 5.1 & 0.8 + 3 & 0.3 + 0.6 \\ - 1.6 + 0.6 & - 1 + 0 & 1.5 + 0 \end{array}]$

Step 5.5

Add $0.8$ and $3$ .

$[\begin{array}{c} 1.9 & 3.3 & 1.1 \\ 5.1 & 3.8 & 0.3 + 0.6 \\ - 1.6 + 0.6 & - 1 + 0 & 1.5 + 0 \end{array}]$

Step 5.6

Add $0.3$ and $0.6$ .

$[\begin{array}{c} 1.9 & 3.3 & 1.1 \\ 5.1 & 3.8 & 0.9 \\ - 1.6 + 0.6 & - 1 + 0 & 1.5 + 0 \end{array}]$

Step 5.7

Add $- 1.6$ and $0.6$ .

$[\begin{array}{c} 1.9 & 3.3 & 1.1 \\ 5.1 & 3.8 & 0.9 \\ - 1 & - 1 + 0 & 1.5 + 0 \end{array}]$

Step 5.8

Add $- 1$ and $0$ .

$[\begin{array}{c} 1.9 & 3.3 & 1.1 \\ 5.1 & 3.8 & 0.9 \\ - 1 & - 1 & 1.5 + 0 \end{array}]$

Step 5.9

Add $1.5$ and $0$ .

$[\begin{array}{c} 1.9 & 3.3 & 1.1 \\ 5.1 & 3.8 & 0.9 \\ - 1 & - 1 & 1.5 \end{array}]$

Step 6

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 row $1$ by its cofactor and add.

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Step 6.1

Consider the corresponding sign chart.

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

Step 6.2

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

Step 6.3

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

$| \begin{array}{c} 3.8 & 0.9 \\ - 1 & 1.5 \end{array} |$

Step 6.4

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

$1.9 | \begin{array}{c} 3.8 & 0.9 \\ - 1 & 1.5 \end{array} |$

Step 6.5

The minor for $a_{12}$ is the determinant with row $1$ and column $2$ deleted.

$| \begin{array}{c} 5.1 & 0.9 \\ - 1 & 1.5 \end{array} |$

Step 6.6

Multiply element $a_{12}$ by its cofactor.

$- 3.3 | \begin{array}{c} 5.1 & 0.9 \\ - 1 & 1.5 \end{array} |$

Step 6.7

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

$| \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 6.8

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

$1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 6.9

Add the terms together.

$1.9 | \begin{array}{c} 3.8 & 0.9 \\ - 1 & 1.5 \end{array} | - 3.3 | \begin{array}{c} 5.1 & 0.9 \\ - 1 & 1.5 \end{array} | + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 7

Evaluate $| \begin{array}{c} 3.8 & 0.9 \\ - 1 & 1.5 \end{array} |$ .

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Step 7.1

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

$1.9 (3.8 \cdot 1.5 - (- 1 \cdot 0.9)) - 3.3 | \begin{array}{c} 5.1 & 0.9 \\ - 1 & 1.5 \end{array} | + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 7.2

Simplify the determinant.

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Step 7.2.1

Simplify each term.

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Step 7.2.1.1

Multiply $3.8$ by $1.5$ .

$1.9 (5.7 - (- 1 \cdot 0.9)) - 3.3 | \begin{array}{c} 5.1 & 0.9 \\ - 1 & 1.5 \end{array} | + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 7.2.1.2

Multiply $- (- 1 \cdot 0.9)$ .

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Step 7.2.1.2.1

Multiply $- 1$ by $0.9$ .

$1.9 (5.7 - - 0.9) - 3.3 | \begin{array}{c} 5.1 & 0.9 \\ - 1 & 1.5 \end{array} | + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 7.2.1.2.2

Multiply $- 1$ by $- 0.9$ .

$1.9 (5.7 + 0.9) - 3.3 | \begin{array}{c} 5.1 & 0.9 \\ - 1 & 1.5 \end{array} | + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 7.2.2

Add $5.7$ and $0.9$ .

$1.9 \cdot 6.6 - 3.3 | \begin{array}{c} 5.1 & 0.9 \\ - 1 & 1.5 \end{array} | + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 8

Evaluate $| \begin{array}{c} 5.1 & 0.9 \\ - 1 & 1.5 \end{array} |$ .

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Step 8.1

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

$1.9 \cdot 6.6 - 3.3 (5.1 \cdot 1.5 - (- 1 \cdot 0.9)) + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 8.2

Simplify the determinant.

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Step 8.2.1

Simplify each term.

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Step 8.2.1.1

Multiply $5.1$ by $1.5$ .

$1.9 \cdot 6.6 - 3.3 (7.65 - (- 1 \cdot 0.9)) + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 8.2.1.2

Multiply $- (- 1 \cdot 0.9)$ .

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Step 8.2.1.2.1

Multiply $- 1$ by $0.9$ .

$1.9 \cdot 6.6 - 3.3 (7.65 - - 0.9) + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 8.2.1.2.2

Multiply $- 1$ by $- 0.9$ .

$1.9 \cdot 6.6 - 3.3 (7.65 + 0.9) + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 8.2.2

Add $7.65$ and $0.9$ .

$1.9 \cdot 6.6 - 3.3 \cdot 8.55 + 1.1 | \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$

Step 9

Evaluate $| \begin{array}{c} 5.1 & 3.8 \\ - 1 & - 1 \end{array} |$ .

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Step 9.1

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

$1.9 \cdot 6.6 - 3.3 \cdot 8.55 + 1.1 (5.1 \cdot - 1 - (- 1 \cdot 3.8))$

Step 9.2

Simplify the determinant.

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Step 9.2.1

Simplify each term.

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Step 9.2.1.1

Multiply $5.1$ by $- 1$ .

$1.9 \cdot 6.6 - 3.3 \cdot 8.55 + 1.1 (- 5.1 - (- 1 \cdot 3.8))$

Step 9.2.1.2

Multiply $- (- 1 \cdot 3.8)$ .

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Step 9.2.1.2.1

Multiply $- 1$ by $3.8$ .

$1.9 \cdot 6.6 - 3.3 \cdot 8.55 + 1.1 (- 5.1 - - 3.8)$

Step 9.2.1.2.2

Multiply $- 1$ by $- 3.8$ .

$1.9 \cdot 6.6 - 3.3 \cdot 8.55 + 1.1 (- 5.1 + 3.8)$

Step 9.2.2

Add $- 5.1$ and $3.8$ .

$1.9 \cdot 6.6 - 3.3 \cdot 8.55 + 1.1 \cdot - 1.3$

Step 10

Simplify the determinant.

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Step 10.1

Simplify each term.

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Step 10.1.1

Multiply $1.9$ by $6.6$ .

$12.54 - 3.3 \cdot 8.55 + 1.1 \cdot - 1.3$

Step 10.1.2

Multiply $- 3.3$ by $8.55$ .

$12.54 - 28.215 + 1.1 \cdot - 1.3$

Step 10.1.3

Multiply $1.1$ by $- 1.3$ .

$12.54 - 28.215 - 1.43$

Step 10.2

Subtract $28.215$ from $12.54$ .

$- 15.675 - 1.43$

Step 10.3

Subtract $1.43$ from $- 15.675$ .

$- 17.105$