Linear Algebra Examples

$(- \frac{1}{3}) [\begin{array}{c} - 5 \\ 7 \\ 1 \\ 0 \end{array}] + (\frac{1}{2}) [\begin{array}{c} - 2 \\ - 4 \\ 0 \\ 1 \end{array}]$

Step 1

Simplify each term.

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Step 1.1

Multiply $- \frac{1}{3}$ by each element of the matrix.

$[\begin{array}{c} - \frac{1}{3} \cdot - 5 \\ - \frac{1}{3} \cdot 7 \\ - \frac{1}{3} \cdot 1 \\ - \frac{1}{3} \cdot 0 \end{array}] + (\frac{1}{2}) [\begin{array}{c} - 2 \\ - 4 \\ 0 \\ 1 \end{array}]$

Step 1.2

Simplify each element in the matrix.

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Step 1.2.1

Multiply $- \frac{1}{3} \cdot - 5$ .

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Step 1.2.1.1

Multiply $- 5$ by $- 1$ .

$[\begin{array}{c} 5 (\frac{1}{3}) \\ - \frac{1}{3} \cdot 7 \\ - \frac{1}{3} \cdot 1 \\ - \frac{1}{3} \cdot 0 \end{array}] + (\frac{1}{2}) [\begin{array}{c} - 2 \\ - 4 \\ 0 \\ 1 \end{array}]$

Step 1.2.1.2

Combine $5$ and $\frac{1}{3}$ .

$[\begin{array}{c} \frac{5}{3} \\ - \frac{1}{3} \cdot 7 \\ - \frac{1}{3} \cdot 1 \\ - \frac{1}{3} \cdot 0 \end{array}] + (\frac{1}{2}) [\begin{array}{c} - 2 \\ - 4 \\ 0 \\ 1 \end{array}]$

Step 1.2.2

Multiply $- \frac{1}{3} \cdot 7$ .

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Step 1.2.2.1

Multiply $7$ by $- 1$ .

$[\begin{array}{c} \frac{5}{3} \\ - 7 (\frac{1}{3}) \\ - \frac{1}{3} \cdot 1 \\ - \frac{1}{3} \cdot 0 \end{array}] + (\frac{1}{2}) [\begin{array}{c} - 2 \\ - 4 \\ 0 \\ 1 \end{array}]$

Step 1.2.2.2

Combine $- 7$ and $\frac{1}{3}$ .

$[\begin{array}{c} \frac{5}{3} \\ \frac{- 7}{3} \\ - \frac{1}{3} \cdot 1 \\ - \frac{1}{3} \cdot 0 \end{array}] + (\frac{1}{2}) [\begin{array}{c} - 2 \\ - 4 \\ 0 \\ 1 \end{array}]$

Step 1.2.3

Move the negative in front of the fraction.

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \cdot 1 \\ - \frac{1}{3} \cdot 0 \end{array}] + (\frac{1}{2}) [\begin{array}{c} - 2 \\ - 4 \\ 0 \\ 1 \end{array}]$

Step 1.2.4

Multiply $- 1$ by $1$ .

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \\ - \frac{1}{3} \cdot 0 \end{array}] + (\frac{1}{2}) [\begin{array}{c} - 2 \\ - 4 \\ 0 \\ 1 \end{array}]$

Step 1.2.5

Multiply $- \frac{1}{3} \cdot 0$ .

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Step 1.2.5.1

Multiply $0$ by $- 1$ .

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \\ 0 (\frac{1}{3}) \end{array}] + (\frac{1}{2}) [\begin{array}{c} - 2 \\ - 4 \\ 0 \\ 1 \end{array}]$

Step 1.2.5.2

Multiply $0$ by $\frac{1}{3}$ .

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \\ 0 \end{array}] + (\frac{1}{2}) [\begin{array}{c} - 2 \\ - 4 \\ 0 \\ 1 \end{array}]$

Step 1.3

Multiply $\frac{1}{2}$ by each element of the matrix.

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

Step 1.4

Simplify each element in the matrix.

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Step 1.4.1

Cancel the common factor of $2$ .

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Step 1.4.1.1

Factor $2$ out of $- 2$ .

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \\ 0 \end{array}] + [\begin{array}{c} \frac{1}{2} \cdot (2 (- 1)) \\ \frac{1}{2} \cdot - 4 \\ \frac{1}{2} \cdot 0 \\ \frac{1}{2} \cdot 1 \end{array}]$

Step 1.4.1.2

Cancel the common factor.

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \\ 0 \end{array}] + [\begin{array}{c} \frac{1}{2} \cdot (2 \cdot - 1) \\ \frac{1}{2} \cdot - 4 \\ \frac{1}{2} \cdot 0 \\ \frac{1}{2} \cdot 1 \end{array}]$

Step 1.4.1.3

Rewrite the expression.

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

Step 1.4.2

Cancel the common factor of $2$ .

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Step 1.4.2.1

Factor $2$ out of $- 4$ .

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \\ 0 \end{array}] + [\begin{array}{c} - 1 \\ \frac{1}{2} \cdot (2 (- 2)) \\ \frac{1}{2} \cdot 0 \\ \frac{1}{2} \cdot 1 \end{array}]$

Step 1.4.2.2

Cancel the common factor.

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \\ 0 \end{array}] + [\begin{array}{c} - 1 \\ \frac{1}{2} \cdot (2 \cdot - 2) \\ \frac{1}{2} \cdot 0 \\ \frac{1}{2} \cdot 1 \end{array}]$

Step 1.4.2.3

Rewrite the expression.

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \\ 0 \end{array}] + [\begin{array}{c} - 1 \\ - 2 \\ \frac{1}{2} \cdot 0 \\ \frac{1}{2} \cdot 1 \end{array}]$

Step 1.4.3

Multiply $\frac{1}{2}$ by $0$ .

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \\ 0 \end{array}] + [\begin{array}{c} - 1 \\ - 2 \\ 0 \\ \frac{1}{2} \cdot 1 \end{array}]$

Step 1.4.4

Multiply $\frac{1}{2}$ by $1$ .

$[\begin{array}{c} \frac{5}{3} \\ - \frac{7}{3} \\ - \frac{1}{3} \\ 0 \end{array}] + [\begin{array}{c} - 1 \\ - 2 \\ 0 \\ \frac{1}{2} \end{array}]$

Step 2

Add the corresponding elements.

$[\begin{array}{c} \frac{5}{3} - 1 \\ - \frac{7}{3} - 2 \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3

Simplify each element.

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Step 3.1

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$[\begin{array}{c} \frac{5}{3} - 1 \cdot \frac{3}{3} \\ - \frac{7}{3} - 2 \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.2

Combine $- 1$ and $\frac{3}{3}$ .

$[\begin{array}{c} \frac{5}{3} + \frac{- 1 \cdot 3}{3} \\ - \frac{7}{3} - 2 \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.3

Combine the numerators over the common denominator.

$[\begin{array}{c} \frac{5 - 1 \cdot 3}{3} \\ - \frac{7}{3} - 2 \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.4

Simplify the numerator.

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Step 3.4.1

Multiply $- 1$ by $3$ .

$[\begin{array}{c} \frac{5 - 3}{3} \\ - \frac{7}{3} - 2 \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.4.2

Subtract $3$ from $5$ .

$[\begin{array}{c} \frac{2}{3} \\ - \frac{7}{3} - 2 \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.5

To write $- 2$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$[\begin{array}{c} \frac{2}{3} \\ - \frac{7}{3} - 2 \cdot \frac{3}{3} \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.6

Combine $- 2$ and $\frac{3}{3}$ .

$[\begin{array}{c} \frac{2}{3} \\ - \frac{7}{3} + \frac{- 2 \cdot 3}{3} \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.7

Combine the numerators over the common denominator.

$[\begin{array}{c} \frac{2}{3} \\ \frac{- 7 - 2 \cdot 3}{3} \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.8

Simplify the numerator.

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Step 3.8.1

Multiply $- 2$ by $3$ .

$[\begin{array}{c} \frac{2}{3} \\ \frac{- 7 - 6}{3} \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.8.2

Subtract $6$ from $- 7$ .

$[\begin{array}{c} \frac{2}{3} \\ \frac{- 13}{3} \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.9

Move the negative in front of the fraction.

$[\begin{array}{c} \frac{2}{3} \\ - \frac{13}{3} \\ - \frac{1}{3} + 0 \\ 0 + \frac{1}{2} \end{array}]$

Step 3.10

Add $- \frac{1}{3}$ and $0$ .

$[\begin{array}{c} \frac{2}{3} \\ - \frac{13}{3} \\ - \frac{1}{3} \\ 0 + \frac{1}{2} \end{array}]$

Step 3.11

Add $0$ and $\frac{1}{2}$ .

$[\begin{array}{c} \frac{2}{3} \\ - \frac{13}{3} \\ - \frac{1}{3} \\ \frac{1}{2} \end{array}]$