Linear Algebra Examples

$2 C = [\begin{array}{c} 5 & 3 \\ 1 & 2 \end{array}] - 5 D [\begin{array}{c} 4 & 2 \\ 3 & 5 \end{array}]$

Step 1

Multiply $- 5 D$ by each element of the matrix.

$2 C = [\begin{array}{c} 5 & 3 \\ 1 & 2 \end{array}] + [\begin{array}{c} - 5 D \cdot 4 & - 5 D \cdot 2 \\ - 5 D \cdot 3 & - 5 D \cdot 5 \end{array}]$

Step 2

Simplify each element in the matrix.

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Rearrange $- 5 D \cdot 4$ .

$2 C = [\begin{array}{c} 5 & 3 \\ 1 & 2 \end{array}] + [\begin{array}{c} - 20 D & - 5 D \cdot 2 \\ - 5 D \cdot 3 & - 5 D \cdot 5 \end{array}]$

Rearrange $- 5 D \cdot 2$ .

$2 C = [\begin{array}{c} 5 & 3 \\ 1 & 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 5 D \cdot 3 & - 5 D \cdot 5 \end{array}]$

Rearrange $- 5 D \cdot 3$ .

$2 C = [\begin{array}{c} 5 & 3 \\ 1 & 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 5 D \cdot 5 \end{array}]$

Rearrange $- 5 D \cdot 5$ .

$2 C = [\begin{array}{c} 5 & 3 \\ 1 & 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 25 D \end{array}]$

Step 3

Multiply both sides of the equation by $\frac{1}{2}$ .

$\frac{1}{2} \cdot (2 C) = \frac{1}{2} \cdot [\begin{array}{c} 5 & 3 \\ 1 & 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 25 D \end{array}]$

Step 4

Simplify both sides of the equation.

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Cancel the common factor of $2$ .

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Factor $2$ out of $2 C$ .

$\frac{1}{2} \cdot (2 (C)) = \frac{1}{2} \cdot [\begin{array}{c} 5 & 3 \\ 1 & 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 25 D \end{array}]$

Cancel the common factor.

$\frac{1}{2} \cdot (2 C) = \frac{1}{2} \cdot [\begin{array}{c} 5 & 3 \\ 1 & 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 25 D \end{array}]$

Rewrite the expression.

$C = \frac{1}{2} \cdot [\begin{array}{c} 5 & 3 \\ 1 & 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 25 D \end{array}]$

Simplify the right side of the equation.

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Multiply $\frac{1}{2}$ by each element of the matrix.

$C = [\begin{array}{c} \frac{1}{2} \cdot 5 & \frac{1}{2} \cdot 3 \\ \frac{1}{2} \cdot 1 & \frac{1}{2} \cdot 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 25 D \end{array}]$

Simplify each element in the matrix.

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Rearrange $\frac{1}{2} \cdot 5$ .

$C = [\begin{array}{c} \frac{5}{2} & \frac{1}{2} \cdot 3 \\ \frac{1}{2} \cdot 1 & \frac{1}{2} \cdot 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 25 D \end{array}]$

Rearrange $\frac{1}{2} \cdot 3$ .

$C = [\begin{array}{c} \frac{5}{2} & \frac{3}{2} \\ \frac{1}{2} \cdot 1 & \frac{1}{2} \cdot 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 25 D \end{array}]$

Rearrange $\frac{1}{2} \cdot 1$ .

$C = [\begin{array}{c} \frac{5}{2} & \frac{3}{2} \\ \frac{1}{2} & \frac{1}{2} \cdot 2 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 25 D \end{array}]$

Rearrange $\frac{1}{2} \cdot 2$ .

$C = [\begin{array}{c} \frac{5}{2} & \frac{3}{2} \\ \frac{1}{2} & 1 \end{array}] + [\begin{array}{c} - 20 D & - 10 D \\ - 15 D & - 25 D \end{array}]$

Add the corresponding elements.

$C = [\begin{array}{c} \frac{5}{2} - 20 D & \frac{3}{2} - 10 D \\ \frac{1}{2} - 15 D & 1 - 25 D \end{array}]$