Linear Algebra Examples

$[\begin{array}{c} \frac{2}{15} & \frac{1}{5} & 0 \\ \frac{29}{15} & \frac{3}{5} & 2 \\ \frac{13}{15} & \frac{1}{5} & 1 \end{array}] + [\begin{array}{c} - 40 & 5 & - 30 \\ 20 & - 25 & 0 \\ 35 & 40 & - 15 \end{array}]$

Step 1

Add the corresponding elements.

$[\begin{array}{c} \frac{2}{15} - 40 & \frac{1}{5} + 5 & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2

Simplify each element.

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Step 2.1

To write $- 40$ as a fraction with a common denominator, multiply by $\frac{15}{15}$ .

$[\begin{array}{c} \frac{2}{15} - 40 \cdot \frac{15}{15} & \frac{1}{5} + 5 & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.2

Combine $- 40$ and $\frac{15}{15}$ .

$[\begin{array}{c} \frac{2}{15} + \frac{- 40 \cdot 15}{15} & \frac{1}{5} + 5 & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.3

Combine the numerators over the common denominator.

$[\begin{array}{c} \frac{2 - 40 \cdot 15}{15} & \frac{1}{5} + 5 & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.4

Simplify the numerator.

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Step 2.4.1

Multiply $- 40$ by $15$ .

$[\begin{array}{c} \frac{2 - 600}{15} & \frac{1}{5} + 5 & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.4.2

Subtract $600$ from $2$ .

$[\begin{array}{c} \frac{- 598}{15} & \frac{1}{5} + 5 & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.5

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{598}{15} & \frac{1}{5} + 5 & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.6

To write $5$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{1}{5} + 5 \cdot \frac{5}{5} & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.7

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

$[\begin{array}{c} - \frac{598}{15} & \frac{1}{5} + \frac{5 \cdot 5}{5} & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.8

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{598}{15} & \frac{1 + 5 \cdot 5}{5} & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.9

Simplify the numerator.

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Step 2.9.1

Multiply $5$ by $5$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{1 + 25}{5} & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.9.2

Add $1$ and $25$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & 0 - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.10

Subtract $30$ from $0$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{29}{15} + 20 & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.11

To write $20$ as a fraction with a common denominator, multiply by $\frac{15}{15}$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{29}{15} + 20 \cdot \frac{15}{15} & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.12

Combine $20$ and $\frac{15}{15}$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{29}{15} + \frac{20 \cdot 15}{15} & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.13

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{29 + 20 \cdot 15}{15} & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.14

Simplify the numerator.

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Step 2.14.1

Multiply $20$ by $15$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{29 + 300}{15} & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.14.2

Add $29$ and $300$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & \frac{3}{5} - 25 & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.15

To write $- 25$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & \frac{3}{5} - 25 \cdot \frac{5}{5} & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.16

Combine $- 25$ and $\frac{5}{5}$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & \frac{3}{5} + \frac{- 25 \cdot 5}{5} & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.17

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & \frac{3 - 25 \cdot 5}{5} & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.18

Simplify the numerator.

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Step 2.18.1

Multiply $- 25$ by $5$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & \frac{3 - 125}{5} & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.18.2

Subtract $125$ from $3$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & \frac{- 122}{5} & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.19

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 + 0 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.20

Add $2$ and $0$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{13}{15} + 35 & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.21

To write $35$ as a fraction with a common denominator, multiply by $\frac{15}{15}$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{13}{15} + 35 \cdot \frac{15}{15} & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.22

Combine $35$ and $\frac{15}{15}$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{13}{15} + \frac{35 \cdot 15}{15} & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.23

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{13 + 35 \cdot 15}{15} & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.24

Simplify the numerator.

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Step 2.24.1

Multiply $35$ by $15$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{13 + 525}{15} & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.24.2

Add $13$ and $525$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{538}{15} & \frac{1}{5} + 40 & 1 - 15 \end{array}]$

Step 2.25

To write $40$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{538}{15} & \frac{1}{5} + 40 \cdot \frac{5}{5} & 1 - 15 \end{array}]$

Step 2.26

Combine $40$ and $\frac{5}{5}$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{538}{15} & \frac{1}{5} + \frac{40 \cdot 5}{5} & 1 - 15 \end{array}]$

Step 2.27

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{538}{15} & \frac{1 + 40 \cdot 5}{5} & 1 - 15 \end{array}]$

Step 2.28

Simplify the numerator.

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Step 2.28.1

Multiply $40$ by $5$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{538}{15} & \frac{1 + 200}{5} & 1 - 15 \end{array}]$

Step 2.28.2

Add $1$ and $200$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{538}{15} & \frac{201}{5} & 1 - 15 \end{array}]$

Step 2.29

Subtract $15$ from $1$ .

$[\begin{array}{c} - \frac{598}{15} & \frac{26}{5} & - 30 \\ \frac{329}{15} & - \frac{122}{5} & 2 \\ \frac{538}{15} & \frac{201}{5} & - 14 \end{array}]$