Linear Algebra Examples

$m^{- 1} [\begin{array}{c} 1 & 1 & 0 \\ - 1 & 1 & 1 \\ 0 & 3 & 1 \end{array}]$

Step 1

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{m} [\begin{array}{c} 1 & 1 & 0 \\ - 1 & 1 & 1 \\ 0 & 3 & 1 \end{array}]$

Step 2

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

$[\begin{array}{c} \frac{1}{m} \cdot 1 & \frac{1}{m} \cdot 1 & \frac{1}{m} \cdot 0 \\ \frac{1}{m} \cdot - 1 & \frac{1}{m} \cdot 1 & \frac{1}{m} \cdot 1 \\ \frac{1}{m} \cdot 0 & \frac{1}{m} \cdot 3 & \frac{1}{m} \cdot 1 \end{array}]$

Step 3

Simplify each element in the matrix.

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Step 3.1

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

$[\begin{array}{c} \frac{1}{m} & \frac{1}{m} \cdot 1 & \frac{1}{m} \cdot 0 \\ \frac{1}{m} \cdot - 1 & \frac{1}{m} \cdot 1 & \frac{1}{m} \cdot 1 \\ \frac{1}{m} \cdot 0 & \frac{1}{m} \cdot 3 & \frac{1}{m} \cdot 1 \end{array}]$

Step 3.2

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

$[\begin{array}{c} \frac{1}{m} & \frac{1}{m} & \frac{1}{m} \cdot 0 \\ \frac{1}{m} \cdot - 1 & \frac{1}{m} \cdot 1 & \frac{1}{m} \cdot 1 \\ \frac{1}{m} \cdot 0 & \frac{1}{m} \cdot 3 & \frac{1}{m} \cdot 1 \end{array}]$

Step 3.3

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

$[\begin{array}{c} \frac{1}{m} & \frac{1}{m} & 0 \\ \frac{1}{m} \cdot - 1 & \frac{1}{m} \cdot 1 & \frac{1}{m} \cdot 1 \\ \frac{1}{m} \cdot 0 & \frac{1}{m} \cdot 3 & \frac{1}{m} \cdot 1 \end{array}]$

Step 3.4

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

$[\begin{array}{c} \frac{1}{m} & \frac{1}{m} & 0 \\ \frac{- 1}{m} & \frac{1}{m} \cdot 1 & \frac{1}{m} \cdot 1 \\ \frac{1}{m} \cdot 0 & \frac{1}{m} \cdot 3 & \frac{1}{m} \cdot 1 \end{array}]$

Step 3.5

Move the negative in front of the fraction.

$[\begin{array}{c} \frac{1}{m} & \frac{1}{m} & 0 \\ - \frac{1}{m} & \frac{1}{m} \cdot 1 & \frac{1}{m} \cdot 1 \\ \frac{1}{m} \cdot 0 & \frac{1}{m} \cdot 3 & \frac{1}{m} \cdot 1 \end{array}]$

Step 3.6

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

$[\begin{array}{c} \frac{1}{m} & \frac{1}{m} & 0 \\ - \frac{1}{m} & \frac{1}{m} & \frac{1}{m} \cdot 1 \\ \frac{1}{m} \cdot 0 & \frac{1}{m} \cdot 3 & \frac{1}{m} \cdot 1 \end{array}]$

Step 3.7

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

$[\begin{array}{c} \frac{1}{m} & \frac{1}{m} & 0 \\ - \frac{1}{m} & \frac{1}{m} & \frac{1}{m} \\ \frac{1}{m} \cdot 0 & \frac{1}{m} \cdot 3 & \frac{1}{m} \cdot 1 \end{array}]$

Step 3.8

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

$[\begin{array}{c} \frac{1}{m} & \frac{1}{m} & 0 \\ - \frac{1}{m} & \frac{1}{m} & \frac{1}{m} \\ 0 & \frac{1}{m} \cdot 3 & \frac{1}{m} \cdot 1 \end{array}]$

Step 3.9

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

$[\begin{array}{c} \frac{1}{m} & \frac{1}{m} & 0 \\ - \frac{1}{m} & \frac{1}{m} & \frac{1}{m} \\ 0 & \frac{3}{m} & \frac{1}{m} \cdot 1 \end{array}]$

Step 3.10

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

$[\begin{array}{c} \frac{1}{m} & \frac{1}{m} & 0 \\ - \frac{1}{m} & \frac{1}{m} & \frac{1}{m} \\ 0 & \frac{3}{m} & \frac{1}{m} \end{array}]$