Examples

3

$3$

Step 1

The identity matrix or unit matrix of size

3

$3$ is the

3 \times 3

$3 \times 3$ square matrix with ones on the main diagonal and zeros elsewhere.

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

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

Step 2

Multiply the scalar

3

$3$ by the identity matrix.

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

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

Step 3

Simplify.

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Step 3.1

Multiply

3

$3$ by each element of the matrix.

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

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

Step 3.2

Simplify each element in the matrix.

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Step 3.2.1

Multiply

3

$3$ by

1

$1$ .

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

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

Step 3.2.2

Multiply

3

$3$ by

0

$0$ .

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

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

Step 3.2.3

Multiply

3

$3$ by

0

$0$ .

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

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

Step 3.2.4

Multiply

3

$3$ by

0

$0$ .

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

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

Step 3.2.5

Multiply

3

$3$ by

1

$1$ .

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

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

Step 3.2.6

Multiply

3

$3$ by

0

$0$ .

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

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

Step 3.2.7

Multiply

3

$3$ by

0

$0$ .

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

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

Step 3.2.8

Multiply

3

$3$ by

0

$0$ .

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

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

Step 3.2.9

Multiply

3

$3$ by

1

$1$ .

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

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

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

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

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

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

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