Algebra Examples

$[\begin{array}{c} 1 & - 2 & 4 & 11 \\ 0 & 1 & 2 & 11 \\ 0 & 0 & 1 & 4 \end{array}]$

Step 1

Perform the row operation $R_{2} = R_{2} - 2 R_{3}$ to make the entry at $2, 3$ a $0$ .

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Step 1.1

Perform the row operation $R_{2} = R_{2} - 2 R_{3}$ to make the entry at $2, 3$ a $0$ .

$[\begin{array}{c} 1 & - 2 & 4 & 11 \\ 0 - 2 \cdot 0 & 1 - 2 \cdot 0 & 2 - 2 \cdot 1 & 11 - 2 \cdot 4 \\ 0 & 0 & 1 & 4 \end{array}]$

Step 1.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & - 2 & 4 & 11 \\ 0 & 1 & 0 & 3 \\ 0 & 0 & 1 & 4 \end{array}]$

Step 2

Perform the row operation $R_{1} = R_{1} - 4 R_{3}$ to make the entry at $1, 3$ a $0$ .

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Step 2.1

Perform the row operation $R_{1} = R_{1} - 4 R_{3}$ to make the entry at $1, 3$ a $0$ .

$[\begin{array}{c} 1 - 4 \cdot 0 & - 2 - 4 \cdot 0 & 4 - 4 \cdot 1 & 11 - 4 \cdot 4 \\ 0 & 1 & 0 & 3 \\ 0 & 0 & 1 & 4 \end{array}]$

Step 2.2

Simplify $R_{1}$ .

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

Step 3

Perform the row operation $R_{1} = R_{1} + 2 R_{2}$ to make the entry at $1, 2$ a $0$ .

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Step 3.1

Perform the row operation $R_{1} = R_{1} + 2 R_{2}$ to make the entry at $1, 2$ a $0$ .

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

Step 3.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & 0 & 0 & 1 \\ 0 & 1 & 0 & 3 \\ 0 & 0 & 1 & 4 \end{array}]$