Linear Algebra Examples

$[\begin{array}{c} 8 & - 7 \\ 5 & 7 \\ 9 & - 7 \end{array}] - x = 4 \cdot [\begin{array}{c} - 1 & - 5 \\ - 6 & 4 \\ - 8 & 1 \end{array}]$

Step 1

Multiply $4$ by each element of the matrix.

$[\begin{array}{c} 8 & - 7 \\ 5 & 7 \\ 9 & - 7 \end{array}] - x = [\begin{array}{c} 4 \cdot - 1 & 4 \cdot - 5 \\ 4 \cdot - 6 & 4 \cdot 4 \\ 4 \cdot - 8 & 4 \cdot 1 \end{array}]$

Step 2

Simplify each element in the matrix.

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Step 2.1

Multiply $4$ by $- 1$ .

$[\begin{array}{c} 8 & - 7 \\ 5 & 7 \\ 9 & - 7 \end{array}] - x = [\begin{array}{c} - 4 & 4 \cdot - 5 \\ 4 \cdot - 6 & 4 \cdot 4 \\ 4 \cdot - 8 & 4 \cdot 1 \end{array}]$

Step 2.2

Multiply $4$ by $- 5$ .

$[\begin{array}{c} 8 & - 7 \\ 5 & 7 \\ 9 & - 7 \end{array}] - x = [\begin{array}{c} - 4 & - 20 \\ 4 \cdot - 6 & 4 \cdot 4 \\ 4 \cdot - 8 & 4 \cdot 1 \end{array}]$

Step 2.3

Multiply $4$ by $- 6$ .

$[\begin{array}{c} 8 & - 7 \\ 5 & 7 \\ 9 & - 7 \end{array}] - x = [\begin{array}{c} - 4 & - 20 \\ - 24 & 4 \cdot 4 \\ 4 \cdot - 8 & 4 \cdot 1 \end{array}]$

Step 2.4

Multiply $4$ by $4$ .

$[\begin{array}{c} 8 & - 7 \\ 5 & 7 \\ 9 & - 7 \end{array}] - x = [\begin{array}{c} - 4 & - 20 \\ - 24 & 16 \\ 4 \cdot - 8 & 4 \cdot 1 \end{array}]$

Step 2.5

Multiply $4$ by $- 8$ .

$[\begin{array}{c} 8 & - 7 \\ 5 & 7 \\ 9 & - 7 \end{array}] - x = [\begin{array}{c} - 4 & - 20 \\ - 24 & 16 \\ - 32 & 4 \cdot 1 \end{array}]$

Step 2.6

Multiply $4$ by $1$ .

$[\begin{array}{c} 8 & - 7 \\ 5 & 7 \\ 9 & - 7 \end{array}] - x = [\begin{array}{c} - 4 & - 20 \\ - 24 & 16 \\ - 32 & 4 \end{array}]$

Step 3

Move all terms not containing a variable to the right side.

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Step 3.1

Subtract $[\begin{array}{c} 8 & - 7 \\ 5 & 7 \\ 9 & - 7 \end{array}]$ from both sides of the equation.

$- x = [\begin{array}{c} - 4 & - 20 \\ - 24 & 16 \\ - 32 & 4 \end{array}] - [\begin{array}{c} 8 & - 7 \\ 5 & 7 \\ 9 & - 7 \end{array}]$

Step 4

Simplify the right side.

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Step 4.1

Subtract the corresponding elements.

$- x = [\begin{array}{c} - 4 - 8 & - 20 + 7 \\ - 24 - 5 & 16 - 7 \\ - 32 - 9 & 4 + 7 \end{array}]$

Step 4.2

Simplify each element.

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Step 4.2.1

Subtract $8$ from $- 4$ .

$- x = [\begin{array}{c} - 12 & - 20 + 7 \\ - 24 - 5 & 16 - 7 \\ - 32 - 9 & 4 + 7 \end{array}]$

Step 4.2.2

Add $- 20$ and $7$ .

$- x = [\begin{array}{c} - 12 & - 13 \\ - 24 - 5 & 16 - 7 \\ - 32 - 9 & 4 + 7 \end{array}]$

Step 4.2.3

Subtract $5$ from $- 24$ .

$- x = [\begin{array}{c} - 12 & - 13 \\ - 29 & 16 - 7 \\ - 32 - 9 & 4 + 7 \end{array}]$

Step 4.2.4

Subtract $7$ from $16$ .

$- x = [\begin{array}{c} - 12 & - 13 \\ - 29 & 9 \\ - 32 - 9 & 4 + 7 \end{array}]$

Step 4.2.5

Subtract $9$ from $- 32$ .

$- x = [\begin{array}{c} - 12 & - 13 \\ - 29 & 9 \\ - 41 & 4 + 7 \end{array}]$

Step 4.2.6

Add $4$ and $7$ .

$- x = [\begin{array}{c} - 12 & - 13 \\ - 29 & 9 \\ - 41 & 11 \end{array}]$

Step 5

Multiply both sides by $- 1$ .

$- - x = - [\begin{array}{c} - 12 & - 13 \\ - 29 & 9 \\ - 41 & 11 \end{array}]$

Step 6

Simplify.

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Step 6.1

Multiply $- - x$ .

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Step 6.1.1

Multiply $- 1$ by $- 1$ .

$1 x = - [\begin{array}{c} - 12 & - 13 \\ - 29 & 9 \\ - 41 & 11 \end{array}]$

Step 6.1.2

Multiply $x$ by $1$ .

$x = - [\begin{array}{c} - 12 & - 13 \\ - 29 & 9 \\ - 41 & 11 \end{array}]$

Step 6.2

Multiply $- 1$ by each element of the matrix.

$x = [\begin{array}{c} - - 12 & - - 13 \\ - - 29 & - 1 \cdot 9 \\ - - 41 & - 1 \cdot 11 \end{array}]$

Step 6.3

Simplify each element in the matrix.

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Step 6.3.1

Multiply $- 1$ by $- 12$ .

$x = [\begin{array}{c} 12 & - - 13 \\ - - 29 & - 1 \cdot 9 \\ - - 41 & - 1 \cdot 11 \end{array}]$

Step 6.3.2

Multiply $- 1$ by $- 13$ .

$x = [\begin{array}{c} 12 & 13 \\ - - 29 & - 1 \cdot 9 \\ - - 41 & - 1 \cdot 11 \end{array}]$

Step 6.3.3

Multiply $- 1$ by $- 29$ .

$x = [\begin{array}{c} 12 & 13 \\ 29 & - 1 \cdot 9 \\ - - 41 & - 1 \cdot 11 \end{array}]$

Step 6.3.4

Multiply $- 1$ by $9$ .

$x = [\begin{array}{c} 12 & 13 \\ 29 & - 9 \\ - - 41 & - 1 \cdot 11 \end{array}]$

Step 6.3.5

Multiply $- 1$ by $- 41$ .

$x = [\begin{array}{c} 12 & 13 \\ 29 & - 9 \\ 41 & - 1 \cdot 11 \end{array}]$

Step 6.3.6

Multiply $- 1$ by $11$ .

$x = [\begin{array}{c} 12 & 13 \\ 29 & - 9 \\ 41 & - 11 \end{array}]$