Precalculus Examples

$3$

Step 1

The identity matrix or unit matrix of size $3$ is the $3 \times 3$ square matrix with ones on the main diagonal and zeros elsewhere.

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

Step 2

Multiply $3$ by each element of the matrix.

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

Step 3

Simplify each element in the matrix.

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Rearrange $3 \cdot 1$ .

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

Rearrange $3 \cdot 0$ .

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

Rearrange $3 \cdot 0$ .

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

Rearrange $3 \cdot 0$ .

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

Rearrange $3 \cdot 1$ .

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

Rearrange $3 \cdot 0$ .

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

Rearrange $3 \cdot 0$ .

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

Rearrange $3 \cdot 0$ .

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

Rearrange $3 \cdot 1$ .

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

Step 4

Multiply the scalar and the identity matrix.

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

Step 5

Simplify.

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

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