Precalculus Examples

$- 2 X + 3 [\begin{array}{c} 2 & - 8 \\ - 4 & 2 \end{array}] = [\begin{array}{c} 4 & - 6 \\ 2 & - 8 \end{array}]$

Step 1

Simplify each term.

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Step 1.1

Multiply $3$ by each element of the matrix.

$- 2 X + [\begin{array}{c} 3 \cdot 2 & 3 \cdot - 8 \\ 3 \cdot - 4 & 3 \cdot 2 \end{array}] = [\begin{array}{c} 4 & - 6 \\ 2 & - 8 \end{array}]$

Step 1.2

Simplify each element in the matrix.

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Step 1.2.1

Multiply $3$ by $2$ .

$- 2 X + [\begin{array}{c} 6 & 3 \cdot - 8 \\ 3 \cdot - 4 & 3 \cdot 2 \end{array}] = [\begin{array}{c} 4 & - 6 \\ 2 & - 8 \end{array}]$

Step 1.2.2

Multiply $3$ by $- 8$ .

$- 2 X + [\begin{array}{c} 6 & - 24 \\ 3 \cdot - 4 & 3 \cdot 2 \end{array}] = [\begin{array}{c} 4 & - 6 \\ 2 & - 8 \end{array}]$

Step 1.2.3

Multiply $3$ by $- 4$ .

$- 2 X + [\begin{array}{c} 6 & - 24 \\ - 12 & 3 \cdot 2 \end{array}] = [\begin{array}{c} 4 & - 6 \\ 2 & - 8 \end{array}]$

Step 1.2.4

Multiply $3$ by $2$ .

$- 2 X + [\begin{array}{c} 6 & - 24 \\ - 12 & 6 \end{array}] = [\begin{array}{c} 4 & - 6 \\ 2 & - 8 \end{array}]$

Step 2

Move all terms not containing a variable to the right side.

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Step 2.1

Subtract $[\begin{array}{c} 6 & - 24 \\ - 12 & 6 \end{array}]$ from both sides of the equation.

$- 2 X = [\begin{array}{c} 4 & - 6 \\ 2 & - 8 \end{array}] - [\begin{array}{c} 6 & - 24 \\ - 12 & 6 \end{array}]$

Step 3

Simplify the right side.

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Step 3.1

Subtract the corresponding elements.

$- 2 X = [\begin{array}{c} 4 - 6 & - 6 + 24 \\ 2 + 12 & - 8 - 6 \end{array}]$

Step 3.2

Simplify each element.

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Step 3.2.1

Subtract $6$ from $4$ .

$- 2 X = [\begin{array}{c} - 2 & - 6 + 24 \\ 2 + 12 & - 8 - 6 \end{array}]$

Step 3.2.2

Add $- 6$ and $24$ .

$- 2 X = [\begin{array}{c} - 2 & 18 \\ 2 + 12 & - 8 - 6 \end{array}]$

Step 3.2.3

Add $2$ and $12$ .

$- 2 X = [\begin{array}{c} - 2 & 18 \\ 14 & - 8 - 6 \end{array}]$

Step 3.2.4

Subtract $6$ from $- 8$ .

$- 2 X = [\begin{array}{c} - 2 & 18 \\ 14 & - 14 \end{array}]$

Step 4

Multiply both sides by $- \frac{1}{2}$ .

$- \frac{1}{2} (- 2 X) = - \frac{1}{2} [\begin{array}{c} - 2 & 18 \\ 14 & - 14 \end{array}]$

Step 5

Simplify.

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Step 5.1

Cancel the common factor of $2$ .

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Step 5.1.1

Move the leading negative in $- \frac{1}{2}$ into the numerator.

$\frac{- 1}{2} (- 2 X) = - \frac{1}{2} [\begin{array}{c} - 2 & 18 \\ 14 & - 14 \end{array}]$

Step 5.1.2

Factor $2$ out of $- 2 X$ .

$\frac{- 1}{2} (2 (- X)) = - \frac{1}{2} [\begin{array}{c} - 2 & 18 \\ 14 & - 14 \end{array}]$

Step 5.1.3

Cancel the common factor.

$\frac{- 1}{2} (2 (- X)) = - \frac{1}{2} [\begin{array}{c} - 2 & 18 \\ 14 & - 14 \end{array}]$

Step 5.1.4

Rewrite the expression.

$- - X = - \frac{1}{2} [\begin{array}{c} - 2 & 18 \\ 14 & - 14 \end{array}]$

Step 5.2

Multiply $- 1$ by $- 1$ .

$1 X = - \frac{1}{2} [\begin{array}{c} - 2 & 18 \\ 14 & - 14 \end{array}]$

Step 5.3

Multiply $X$ by $1$ .

$X = - \frac{1}{2} [\begin{array}{c} - 2 & 18 \\ 14 & - 14 \end{array}]$

Step 5.4

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

$X = [\begin{array}{c} - \frac{1}{2} \cdot - 2 & - \frac{1}{2} \cdot 18 \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5

Simplify each element in the matrix.

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Step 5.5.1

Cancel the common factor of $2$ .

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Step 5.5.1.1

Move the leading negative in $- \frac{1}{2}$ into the numerator.

$X = [\begin{array}{c} \frac{- 1}{2} \cdot - 2 & - \frac{1}{2} \cdot 18 \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.1.2

Factor $2$ out of $- 2$ .

$X = [\begin{array}{c} \frac{- 1}{2} \cdot (2 (- 1)) & - \frac{1}{2} \cdot 18 \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.1.3

Cancel the common factor.

$X = [\begin{array}{c} \frac{- 1}{2} \cdot (2 \cdot - 1) & - \frac{1}{2} \cdot 18 \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.1.4

Rewrite the expression.

$X = [\begin{array}{c} - 1 \cdot - 1 & - \frac{1}{2} \cdot 18 \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.2

Multiply $- 1$ by $- 1$ .

$X = [\begin{array}{c} 1 & - \frac{1}{2} \cdot 18 \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.3

Cancel the common factor of $2$ .

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Step 5.5.3.1

Move the leading negative in $- \frac{1}{2}$ into the numerator.

$X = [\begin{array}{c} 1 & \frac{- 1}{2} \cdot 18 \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.3.2

Factor $2$ out of $18$ .

$X = [\begin{array}{c} 1 & \frac{- 1}{2} \cdot (2 (9)) \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.3.3

Cancel the common factor.

$X = [\begin{array}{c} 1 & \frac{- 1}{2} \cdot (2 \cdot 9) \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.3.4

Rewrite the expression.

$X = [\begin{array}{c} 1 & - 1 \cdot 9 \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.4

Multiply $- 1$ by $9$ .

$X = [\begin{array}{c} 1 & - 9 \\ - \frac{1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.5

Cancel the common factor of $2$ .

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Step 5.5.5.1

Move the leading negative in $- \frac{1}{2}$ into the numerator.

$X = [\begin{array}{c} 1 & - 9 \\ \frac{- 1}{2} \cdot 14 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.5.2

Factor $2$ out of $14$ .

$X = [\begin{array}{c} 1 & - 9 \\ \frac{- 1}{2} \cdot (2 (7)) & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.5.3

Cancel the common factor.

$X = [\begin{array}{c} 1 & - 9 \\ \frac{- 1}{2} \cdot (2 \cdot 7) & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.5.4

Rewrite the expression.

$X = [\begin{array}{c} 1 & - 9 \\ - 1 \cdot 7 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.6

Multiply $- 1$ by $7$ .

$X = [\begin{array}{c} 1 & - 9 \\ - 7 & - \frac{1}{2} \cdot - 14 \end{array}]$

Step 5.5.7

Cancel the common factor of $2$ .

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Step 5.5.7.1

Move the leading negative in $- \frac{1}{2}$ into the numerator.

$X = [\begin{array}{c} 1 & - 9 \\ - 7 & \frac{- 1}{2} \cdot - 14 \end{array}]$

Step 5.5.7.2

Factor $2$ out of $- 14$ .

$X = [\begin{array}{c} 1 & - 9 \\ - 7 & \frac{- 1}{2} \cdot (2 (- 7)) \end{array}]$

Step 5.5.7.3

Cancel the common factor.

$X = [\begin{array}{c} 1 & - 9 \\ - 7 & \frac{- 1}{2} \cdot (2 \cdot - 7) \end{array}]$

Step 5.5.7.4

Rewrite the expression.

$X = [\begin{array}{c} 1 & - 9 \\ - 7 & - 1 \cdot - 7 \end{array}]$

Step 5.5.8

Multiply $- 1$ by $- 7$ .

$X = [\begin{array}{c} 1 & - 9 \\ - 7 & 7 \end{array}]$