Linear Algebra Examples

$- a + b [\begin{array}{c} - 2 & 2 & 8 \\ 2 & - 1 & - 2 \\ 2 & - 1 & - 4 \end{array}]$

Step 1

Multiply $b$ by each element of the matrix.

$- a + [\begin{array}{c} b \cdot - 2 & b \cdot 2 & b \cdot 8 \\ b \cdot 2 & b \cdot - 1 & b \cdot - 2 \\ b \cdot 2 & b \cdot - 1 & b \cdot - 4 \end{array}]$

Step 2

Simplify each element in the matrix.

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Step 2.1

Move $- 2$ to the left of $b$ .

$- a + [\begin{array}{c} - 2 b & b \cdot 2 & b \cdot 8 \\ b \cdot 2 & b \cdot - 1 & b \cdot - 2 \\ b \cdot 2 & b \cdot - 1 & b \cdot - 4 \end{array}]$

Step 2.2

Move $2$ to the left of $b$ .

$- a + [\begin{array}{c} - 2 b & 2 b & b \cdot 8 \\ b \cdot 2 & b \cdot - 1 & b \cdot - 2 \\ b \cdot 2 & b \cdot - 1 & b \cdot - 4 \end{array}]$

Step 2.3

Move $8$ to the left of $b$ .

$- a + [\begin{array}{c} - 2 b & 2 b & 8 b \\ b \cdot 2 & b \cdot - 1 & b \cdot - 2 \\ b \cdot 2 & b \cdot - 1 & b \cdot - 4 \end{array}]$

Step 2.4

Move $2$ to the left of $b$ .

$- a + [\begin{array}{c} - 2 b & 2 b & 8 b \\ 2 b & b \cdot - 1 & b \cdot - 2 \\ b \cdot 2 & b \cdot - 1 & b \cdot - 4 \end{array}]$

Step 2.5

Move $- 1$ to the left of $b$ .

$- a + [\begin{array}{c} - 2 b & 2 b & 8 b \\ 2 b & - 1 \cdot b & b \cdot - 2 \\ b \cdot 2 & b \cdot - 1 & b \cdot - 4 \end{array}]$

Step 2.6

Rewrite $- 1 b$ as $- b$ .

$- a + [\begin{array}{c} - 2 b & 2 b & 8 b \\ 2 b & - b & b \cdot - 2 \\ b \cdot 2 & b \cdot - 1 & b \cdot - 4 \end{array}]$

Step 2.7

Move $- 2$ to the left of $b$ .

$- a + [\begin{array}{c} - 2 b & 2 b & 8 b \\ 2 b & - b & - 2 b \\ b \cdot 2 & b \cdot - 1 & b \cdot - 4 \end{array}]$

Step 2.8

Move $2$ to the left of $b$ .

$- a + [\begin{array}{c} - 2 b & 2 b & 8 b \\ 2 b & - b & - 2 b \\ 2 b & b \cdot - 1 & b \cdot - 4 \end{array}]$

Step 2.9

Move $- 1$ to the left of $b$ .

$- a + [\begin{array}{c} - 2 b & 2 b & 8 b \\ 2 b & - b & - 2 b \\ 2 b & - 1 \cdot b & b \cdot - 4 \end{array}]$

Step 2.10

Rewrite $- 1 b$ as $- b$ .

$- a + [\begin{array}{c} - 2 b & 2 b & 8 b \\ 2 b & - b & - 2 b \\ 2 b & - b & b \cdot - 4 \end{array}]$

Step 2.11

Move $- 4$ to the left of $b$ .

$- a + [\begin{array}{c} - 2 b & 2 b & 8 b \\ 2 b & - b & - 2 b \\ 2 b & - b & - 4 b \end{array}]$