Linear Algebra Examples

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] - 2 [\begin{array}{c} - 1 & 2 & 4 \\ - 2 & 0 & 3 \\ 5 & - 6 & 1 \end{array}]$

Step 1

Simplify each term.

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Step 1.1

Multiply $- 2$ by each element of the matrix.

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] + [\begin{array}{c} - 2 \cdot - 1 & - 2 \cdot 2 & - 2 \cdot 4 \\ - 2 \cdot - 2 & - 2 \cdot 0 & - 2 \cdot 3 \\ - 2 \cdot 5 & - 2 \cdot - 6 & - 2 \cdot 1 \end{array}]$

Step 1.2

Simplify each element in the matrix.

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Step 1.2.1

Multiply $- 2$ by $- 1$ .

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] + [\begin{array}{c} 2 & - 2 \cdot 2 & - 2 \cdot 4 \\ - 2 \cdot - 2 & - 2 \cdot 0 & - 2 \cdot 3 \\ - 2 \cdot 5 & - 2 \cdot - 6 & - 2 \cdot 1 \end{array}]$

Step 1.2.2

Multiply $- 2$ by $2$ .

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] + [\begin{array}{c} 2 & - 4 & - 2 \cdot 4 \\ - 2 \cdot - 2 & - 2 \cdot 0 & - 2 \cdot 3 \\ - 2 \cdot 5 & - 2 \cdot - 6 & - 2 \cdot 1 \end{array}]$

Step 1.2.3

Multiply $- 2$ by $4$ .

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] + [\begin{array}{c} 2 & - 4 & - 8 \\ - 2 \cdot - 2 & - 2 \cdot 0 & - 2 \cdot 3 \\ - 2 \cdot 5 & - 2 \cdot - 6 & - 2 \cdot 1 \end{array}]$

Step 1.2.4

Multiply $- 2$ by $- 2$ .

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] + [\begin{array}{c} 2 & - 4 & - 8 \\ 4 & - 2 \cdot 0 & - 2 \cdot 3 \\ - 2 \cdot 5 & - 2 \cdot - 6 & - 2 \cdot 1 \end{array}]$

Step 1.2.5

Multiply $- 2$ by $0$ .

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] + [\begin{array}{c} 2 & - 4 & - 8 \\ 4 & 0 & - 2 \cdot 3 \\ - 2 \cdot 5 & - 2 \cdot - 6 & - 2 \cdot 1 \end{array}]$

Step 1.2.6

Multiply $- 2$ by $3$ .

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] + [\begin{array}{c} 2 & - 4 & - 8 \\ 4 & 0 & - 6 \\ - 2 \cdot 5 & - 2 \cdot - 6 & - 2 \cdot 1 \end{array}]$

Step 1.2.7

Multiply $- 2$ by $5$ .

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] + [\begin{array}{c} 2 & - 4 & - 8 \\ 4 & 0 & - 6 \\ - 10 & - 2 \cdot - 6 & - 2 \cdot 1 \end{array}]$

Step 1.2.8

Multiply $- 2$ by $- 6$ .

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] + [\begin{array}{c} 2 & - 4 & - 8 \\ 4 & 0 & - 6 \\ - 10 & 12 & - 2 \cdot 1 \end{array}]$

Step 1.2.9

Multiply $- 2$ by $1$ .

$[\begin{array}{c} - 4 & 3 & - 6 \\ 0 & 2 & 7 \\ 10 & 15 & - 3 \end{array}] + [\begin{array}{c} 2 & - 4 & - 8 \\ 4 & 0 & - 6 \\ - 10 & 12 & - 2 \end{array}]$

Step 2

Add the corresponding elements.

$[\begin{array}{c} - 4 + 2 & 3 - 4 & - 6 - 8 \\ 0 + 4 & 2 + 0 & 7 - 6 \\ 10 - 10 & 15 + 12 & - 3 - 2 \end{array}]$

Step 3

Simplify each element.

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Step 3.1

Add $- 4$ and $2$ .

$[\begin{array}{c} - 2 & 3 - 4 & - 6 - 8 \\ 0 + 4 & 2 + 0 & 7 - 6 \\ 10 - 10 & 15 + 12 & - 3 - 2 \end{array}]$

Step 3.2

Subtract $4$ from $3$ .

$[\begin{array}{c} - 2 & - 1 & - 6 - 8 \\ 0 + 4 & 2 + 0 & 7 - 6 \\ 10 - 10 & 15 + 12 & - 3 - 2 \end{array}]$

Step 3.3

Subtract $8$ from $- 6$ .

$[\begin{array}{c} - 2 & - 1 & - 14 \\ 0 + 4 & 2 + 0 & 7 - 6 \\ 10 - 10 & 15 + 12 & - 3 - 2 \end{array}]$

Step 3.4

Add $0$ and $4$ .

$[\begin{array}{c} - 2 & - 1 & - 14 \\ 4 & 2 + 0 & 7 - 6 \\ 10 - 10 & 15 + 12 & - 3 - 2 \end{array}]$

Step 3.5

Add $2$ and $0$ .

$[\begin{array}{c} - 2 & - 1 & - 14 \\ 4 & 2 & 7 - 6 \\ 10 - 10 & 15 + 12 & - 3 - 2 \end{array}]$

Step 3.6

Subtract $6$ from $7$ .

$[\begin{array}{c} - 2 & - 1 & - 14 \\ 4 & 2 & 1 \\ 10 - 10 & 15 + 12 & - 3 - 2 \end{array}]$

Step 3.7

Subtract $10$ from $10$ .

$[\begin{array}{c} - 2 & - 1 & - 14 \\ 4 & 2 & 1 \\ 0 & 15 + 12 & - 3 - 2 \end{array}]$

Step 3.8

Add $15$ and $12$ .

$[\begin{array}{c} - 2 & - 1 & - 14 \\ 4 & 2 & 1 \\ 0 & 27 & - 3 - 2 \end{array}]$

Step 3.9

Subtract $2$ from $- 3$ .

$[\begin{array}{c} - 2 & - 1 & - 14 \\ 4 & 2 & 1 \\ 0 & 27 & - 5 \end{array}]$