Finite Math Examples

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 4 \end{array}]$

Step 1

Multiply both sides by $1$ .

$1 ([\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}]) = 1 [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 4 \end{array}]$

Step 2

Simplify.

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Step 2.1

Multiply $1$ by each element of the matrix.

$[\begin{array}{c} 1 (a + 10) & 1 (9 z + 1) & 1 (2 m) \\ 1 (6 k) & 1 \cdot 2 & 1 \cdot 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = 1 [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 4 \end{array}]$

Step 2.2

Simplify each element in the matrix.

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Step 2.2.1

Multiply $a + 10$ by $1$ .

$[\begin{array}{c} a + 10 & 1 (9 z + 1) & 1 (2 m) \\ 1 (6 k) & 1 \cdot 2 & 1 \cdot 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = 1 [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 4 \end{array}]$

Step 2.2.2

Multiply $9 z + 1$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 1 (2 m) \\ 1 (6 k) & 1 \cdot 2 & 1 \cdot 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = 1 [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 4 \end{array}]$

Step 2.2.3

Multiply $2 m$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 1 (6 k) & 1 \cdot 2 & 1 \cdot 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = 1 [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 4 \end{array}]$

Step 2.2.4

Multiply $6 k$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 1 \cdot 2 & 1 \cdot 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = 1 [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 4 \end{array}]$

Step 2.2.5

Multiply $2$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \cdot 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = 1 [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 4 \end{array}]$

Step 2.2.6

Multiply $1$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = 1 [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 4 \end{array}]$

Step 2.3

Multiply $1$ by each element of the matrix.

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = [\begin{array}{c} 1 \cdot 20 & 1 \cdot - 32 & 1 \cdot 90 \\ 1 \cdot 45 & 1 \cdot 4 & 1 \cdot 4 \end{array}]$

Step 2.4

Simplify each element in the matrix.

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Step 2.4.1

Multiply $20$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = [\begin{array}{c} 20 & 1 \cdot - 32 & 1 \cdot 90 \\ 1 \cdot 45 & 1 \cdot 4 & 1 \cdot 4 \end{array}]$

Step 2.4.2

Multiply $- 32$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = [\begin{array}{c} 20 & - 32 & 1 \cdot 90 \\ 1 \cdot 45 & 1 \cdot 4 & 1 \cdot 4 \end{array}]$

Step 2.4.3

Multiply $90$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = [\begin{array}{c} 20 & - 32 & 90 \\ 1 \cdot 45 & 1 \cdot 4 & 1 \cdot 4 \end{array}]$

Step 2.4.4

Multiply $45$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 1 \cdot 4 & 1 \cdot 4 \end{array}]$

Step 2.4.5

Multiply $4$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 1 \cdot 4 \end{array}]$

Step 2.4.6

Multiply $4$ by $1$ .

$[\begin{array}{c} a + 10 & 9 z + 1 & 2 m \\ 6 k & 2 & 1 \end{array}] [\begin{array}{c} 9 a & 2 z & 8 m \\ 9 k & 2 & 3 \end{array}] = [\begin{array}{c} 20 & - 32 & 90 \\ 45 & 4 & 4 \end{array}]$