Linear Algebra Examples

$A = [\begin{array}{c} - 3 - 3 i & 1 - 3 i \\ - 3 + i & 2 + 4 i \end{array}]$

Step 1

The inverse of a $2 \times 2$ matrix can be found using the formula $\frac{1}{a d - b c} [\begin{array}{c} d & - b \\ - c & a \end{array}]$ where $a d - b c$ is the determinant.

Step 2

Find the determinant.

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Step 2.1

The determinant of a $2 \times 2$ matrix can be found using the formula $| \begin{array}{c} a & b \\ c & d \end{array} | = a d - c b$ .

$(- 3 - 3 i) (2 + 4 i) - (- 3 + i) (1 - 3 i)$

Step 2.2

Simplify the determinant.

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Step 2.2.1

Simplify each term.

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Step 2.2.1.1

Expand $(- 3 - 3 i) (2 + 4 i)$ using the FOIL Method.

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Step 2.2.1.1.1

Apply the distributive property.

$- 3 (2 + 4 i) - 3 i (2 + 4 i) - (- 3 + i) (1 - 3 i)$

Step 2.2.1.1.2

Apply the distributive property.

$- 3 \cdot 2 - 3 (4 i) - 3 i (2 + 4 i) - (- 3 + i) (1 - 3 i)$

Step 2.2.1.1.3

Apply the distributive property.

$- 3 \cdot 2 - 3 (4 i) - 3 i \cdot 2 - 3 i (4 i) - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2

Simplify and combine like terms.

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Step 2.2.1.2.1

Simplify each term.

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Step 2.2.1.2.1.1

Multiply $- 3$ by $2$ .

$- 6 - 3 (4 i) - 3 i \cdot 2 - 3 i (4 i) - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.1.2

Multiply $4$ by $- 3$ .

$- 6 - 12 i - 3 i \cdot 2 - 3 i (4 i) - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.1.3

Multiply $2$ by $- 3$ .

$- 6 - 12 i - 6 i - 3 i (4 i) - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.1.4

Multiply $- 3 i (4 i)$ .

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Step 2.2.1.2.1.4.1

Multiply $4$ by $- 3$ .

$- 6 - 12 i - 6 i - 12 i i - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.1.4.2

Raise $i$ to the power of $1$ .

$- 6 - 12 i - 6 i - 12 (i^{1} i) - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.1.4.3

Raise $i$ to the power of $1$ .

$- 6 - 12 i - 6 i - 12 (i^{1} i^{1}) - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.1.4.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$- 6 - 12 i - 6 i - 12 i^{1 + 1} - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.1.4.5

Add $1$ and $1$ .

$- 6 - 12 i - 6 i - 12 i^{2} - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.1.5

Rewrite $i^{2}$ as $- 1$ .

$- 6 - 12 i - 6 i - 12 \cdot - 1 - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.1.6

Multiply $- 12$ by $- 1$ .

$- 6 - 12 i - 6 i + 12 - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.2

Add $- 6$ and $12$ .

$6 - 12 i - 6 i - (- 3 + i) (1 - 3 i)$

Step 2.2.1.2.3

Subtract $6 i$ from $- 12 i$ .

$6 - 18 i - (- 3 + i) (1 - 3 i)$

Step 2.2.1.3

Apply the distributive property.

$6 - 18 i + (- - 3 - i) (1 - 3 i)$

Step 2.2.1.4

Multiply $- 1$ by $- 3$ .

$6 - 18 i + (3 - i) (1 - 3 i)$

Step 2.2.1.5

Expand $(3 - i) (1 - 3 i)$ using the FOIL Method.

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Step 2.2.1.5.1

Apply the distributive property.

$6 - 18 i + 3 (1 - 3 i) - i (1 - 3 i)$

Step 2.2.1.5.2

Apply the distributive property.

$6 - 18 i + 3 \cdot 1 + 3 (- 3 i) - i (1 - 3 i)$

Step 2.2.1.5.3

Apply the distributive property.

$6 - 18 i + 3 \cdot 1 + 3 (- 3 i) - i \cdot 1 - i (- 3 i)$

Step 2.2.1.6

Simplify and combine like terms.

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Step 2.2.1.6.1

Simplify each term.

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Step 2.2.1.6.1.1

Multiply $3$ by $1$ .

$6 - 18 i + 3 + 3 (- 3 i) - i \cdot 1 - i (- 3 i)$

Step 2.2.1.6.1.2

Multiply $- 3$ by $3$ .

$6 - 18 i + 3 - 9 i - i \cdot 1 - i (- 3 i)$

Step 2.2.1.6.1.3

Multiply $- 1$ by $1$ .

$6 - 18 i + 3 - 9 i - i - i (- 3 i)$

Step 2.2.1.6.1.4

Multiply $- i (- 3 i)$ .

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Step 2.2.1.6.1.4.1

Multiply $- 3$ by $- 1$ .

$6 - 18 i + 3 - 9 i - i + 3 i i$

Step 2.2.1.6.1.4.2

Raise $i$ to the power of $1$ .

$6 - 18 i + 3 - 9 i - i + 3 (i^{1} i)$

Step 2.2.1.6.1.4.3

Raise $i$ to the power of $1$ .

$6 - 18 i + 3 - 9 i - i + 3 (i^{1} i^{1})$

Step 2.2.1.6.1.4.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$6 - 18 i + 3 - 9 i - i + 3 i^{1 + 1}$

Step 2.2.1.6.1.4.5

Add $1$ and $1$ .

$6 - 18 i + 3 - 9 i - i + 3 i^{2}$

Step 2.2.1.6.1.5

Rewrite $i^{2}$ as $- 1$ .

$6 - 18 i + 3 - 9 i - i + 3 \cdot - 1$

Step 2.2.1.6.1.6

Multiply $3$ by $- 1$ .

$6 - 18 i + 3 - 9 i - i - 3$

Step 2.2.1.6.2

Subtract $3$ from $3$ .

$6 - 18 i + 0 - 9 i - i$

Step 2.2.1.6.3

Subtract $9 i$ from $0$ .

$6 - 18 i - 9 i - i$

Step 2.2.1.6.4

Subtract $i$ from $- 9 i$ .

$6 - 18 i - 10 i$

Step 2.2.2

Subtract $10 i$ from $- 18 i$ .

$6 - 28 i$

Step 3

Since the determinant is non-zero, the inverse exists.

Step 4

Substitute the known values into the formula for the inverse.

$\frac{1}{6 - 28 i} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 5

Multiply the numerator and denominator of $\frac{1}{6 - 28 i}$ by the conjugate of $6 - 28 i$ to make the denominator real.

$\frac{1}{6 - 28 i} \cdot \frac{6 + 28 i}{6 + 28 i} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6

Multiply.

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Step 6.1

Combine.

$\frac{1 (6 + 28 i)}{(6 - 28 i) (6 + 28 i)} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.2

Multiply $6 + 28 i$ by $1$ .

$\frac{6 + 28 i}{(6 - 28 i) (6 + 28 i)} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3

Simplify the denominator.

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Step 6.3.1

Expand $(6 - 28 i) (6 + 28 i)$ using the FOIL Method.

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Step 6.3.1.1

Apply the distributive property.

$\frac{6 + 28 i}{6 (6 + 28 i) - 28 i (6 + 28 i)} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.1.2

Apply the distributive property.

$\frac{6 + 28 i}{6 \cdot 6 + 6 (28 i) - 28 i (6 + 28 i)} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.1.3

Apply the distributive property.

$\frac{6 + 28 i}{6 \cdot 6 + 6 (28 i) - 28 i \cdot 6 - 28 i (28 i)} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.2

Simplify.

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Step 6.3.2.1

Multiply $6$ by $6$ .

$\frac{6 + 28 i}{36 + 6 (28 i) - 28 i \cdot 6 - 28 i (28 i)} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.2.2

Multiply $28$ by $6$ .

$\frac{6 + 28 i}{36 + 168 i - 28 i \cdot 6 - 28 i (28 i)} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.2.3

Multiply $6$ by $- 28$ .

$\frac{6 + 28 i}{36 + 168 i - 168 i - 28 i (28 i)} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.2.4

Multiply $28$ by $- 28$ .

$\frac{6 + 28 i}{36 + 168 i - 168 i - 784 i i} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.2.5

Raise $i$ to the power of $1$ .

$\frac{6 + 28 i}{36 + 168 i - 168 i - 784 (i^{1} i)} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.2.6

Raise $i$ to the power of $1$ .

$\frac{6 + 28 i}{36 + 168 i - 168 i - 784 (i^{1} i^{1})} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.2.7

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{6 + 28 i}{36 + 168 i - 168 i - 784 i^{1 + 1}} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.2.8

Add $1$ and $1$ .

$\frac{6 + 28 i}{36 + 168 i - 168 i - 784 i^{2}} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.2.9

Subtract $168 i$ from $168 i$ .

$\frac{6 + 28 i}{36 + 0 - 784 i^{2}} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.2.10

Add $36$ and $0$ .

$\frac{6 + 28 i}{36 - 784 i^{2}} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.3

Simplify each term.

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Step 6.3.3.1

Rewrite $i^{2}$ as $- 1$ .

$\frac{6 + 28 i}{36 - 784 \cdot - 1} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.3.2

Multiply $- 784$ by $- 1$ .

$\frac{6 + 28 i}{36 + 784} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 6.3.4

Add $36$ and $784$ .

$\frac{6 + 28 i}{820} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 7

Cancel the common factor of $6 + 28 i$ and $820$ .

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Step 7.1

Factor $2$ out of $6$ .

$\frac{2 (3) + 28 i}{820} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 7.2

Factor $2$ out of $28 i$ .

$\frac{2 (3) + 2 (14 i)}{820} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 7.3

Factor $2$ out of $2 (3) + 2 (14 i)$ .

$\frac{2 (3 + 14 i)}{820} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 7.4

Cancel the common factors.

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Step 7.4.1

Factor $2$ out of $820$ .

$\frac{2 (3 + 14 i)}{2 \cdot 410} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 7.4.2

Cancel the common factor.

$\frac{2 (3 + 14 i)}{2 \cdot 410} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 7.4.3

Rewrite the expression.

$\frac{3 + 14 i}{410} [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 8

Split the fraction $\frac{3 + 14 i}{410}$ into two fractions.

$(\frac{3}{410} + \frac{14 i}{410}) [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 9

Cancel the common factor of $14$ and $410$ .

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Step 9.1

Factor $2$ out of $14 i$ .

$(\frac{3}{410} + \frac{2 (7 i)}{410}) [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 9.2

Cancel the common factors.

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Step 9.2.1

Factor $2$ out of $410$ .

$(\frac{3}{410} + \frac{2 (7 i)}{2 (205)}) [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 9.2.2

Cancel the common factor.

$(\frac{3}{410} + \frac{2 (7 i)}{2 \cdot 205}) [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 9.2.3

Rewrite the expression.

$(\frac{3}{410} + \frac{7 i}{205}) [\begin{array}{c} 2 + 4 i & - (1 - 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 10

Apply the distributive property.

$(\frac{3}{410} + \frac{7 i}{205}) [\begin{array}{c} 2 + 4 i & - 1 \cdot 1 - (- 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 11

Multiply $- 1$ by $1$ .

$(\frac{3}{410} + \frac{7 i}{205}) [\begin{array}{c} 2 + 4 i & - 1 - (- 3 i) \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 12

Multiply $- 3$ by $- 1$ .

$(\frac{3}{410} + \frac{7 i}{205}) [\begin{array}{c} 2 + 4 i & - 1 + 3 i \\ - (- 3 + i) & - 3 - 3 i \end{array}]$

Step 13

Apply the distributive property.

$(\frac{3}{410} + \frac{7 i}{205}) [\begin{array}{c} 2 + 4 i & - 1 + 3 i \\ - - 3 - i & - 3 - 3 i \end{array}]$

Step 14

Multiply $- 1$ by $- 3$ .

$(\frac{3}{410} + \frac{7 i}{205}) [\begin{array}{c} 2 + 4 i & - 1 + 3 i \\ 3 - i & - 3 - 3 i \end{array}]$

Step 15

Multiply $\frac{3}{410} + \frac{7 i}{205}$ by each element of the matrix.

$[\begin{array}{c} (\frac{3}{410} + \frac{7 i}{205}) (2 + 4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16

Simplify each element in the matrix.

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Step 16.1

Expand $(\frac{3}{410} + \frac{7 i}{205}) (2 + 4 i)$ using the FOIL Method.

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Step 16.1.1

Apply the distributive property.

$[\begin{array}{c} \frac{3}{410} (2 + 4 i) + \frac{7 i}{205} (2 + 4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.1.2

Apply the distributive property.

$[\begin{array}{c} \frac{3}{410} \cdot 2 + \frac{3}{410} (4 i) + \frac{7 i}{205} (2 + 4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.1.3

Apply the distributive property.

$[\begin{array}{c} \frac{3}{410} \cdot 2 + \frac{3}{410} (4 i) + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2

Simplify and combine like terms.

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Step 16.2.1

Simplify each term.

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Step 16.2.1.1

Cancel the common factor of $2$ .

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Step 16.2.1.1.1

Factor $2$ out of $410$ .

$[\begin{array}{c} \frac{3}{2 (205)} \cdot 2 + \frac{3}{410} (4 i) + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.1.2

Cancel the common factor.

$[\begin{array}{c} \frac{3}{2 \cdot 205} \cdot 2 + \frac{3}{410} (4 i) + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.1.3

Rewrite the expression.

$[\begin{array}{c} \frac{3}{205} + \frac{3}{410} (4 i) + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.2

Cancel the common factor of $2$ .

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Step 16.2.1.2.1

Factor $2$ out of $410$ .

$[\begin{array}{c} \frac{3}{205} + \frac{3}{2 (205)} (4 i) + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.2.2

Factor $2$ out of $4 i$ .

$[\begin{array}{c} \frac{3}{205} + \frac{3}{2 (205)} (2 (2 i)) + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.2.3

Cancel the common factor.

$[\begin{array}{c} \frac{3}{205} + \frac{3}{2 \cdot 205} (2 (2 i)) + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.2.4

Rewrite the expression.

$[\begin{array}{c} \frac{3}{205} + \frac{3}{205} (2 i) + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.3

Combine $2$ and $\frac{3}{205}$ .

$[\begin{array}{c} \frac{3}{205} + \frac{2 \cdot 3}{205} i + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.4

Multiply $2$ by $3$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6}{205} i + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.5

Combine $\frac{6}{205}$ and $i$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{7 i}{205} \cdot 2 + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.6

Multiply $\frac{7 i}{205} \cdot 2$ .

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Step 16.2.1.6.1

Combine $\frac{7 i}{205}$ and $2$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{7 i \cdot 2}{205} + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.6.2

Multiply $2$ by $7$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} + \frac{7 i}{205} (4 i) & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.7

Multiply $\frac{7 i}{205} (4 i)$ .

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Step 16.2.1.7.1

Combine $4$ and $\frac{7 i}{205}$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} + \frac{4 (7 i)}{205} i & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.7.2

Multiply $7$ by $4$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} + \frac{28 i}{205} i & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.7.3

Combine $\frac{28 i}{205}$ and $i$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} + \frac{28 i i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.7.4

Raise $i$ to the power of $1$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} + \frac{28 (i^{1} i)}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.7.5

Raise $i$ to the power of $1$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} + \frac{28 (i^{1} i^{1})}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.7.6

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} + \frac{28 i^{1 + 1}}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.7.7

Add $1$ and $1$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} + \frac{28 i^{2}}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.8

Rewrite $i^{2}$ as $- 1$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} + \frac{28 \cdot - 1}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.9

Multiply $28$ by $- 1$ .

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} + \frac{- 28}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.1.10

Move the negative in front of the fraction.

$[\begin{array}{c} \frac{3}{205} + \frac{6 i}{205} + \frac{14 i}{205} - \frac{28}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.2

Combine the numerators over the common denominator.

$[\begin{array}{c} \frac{3 - 28}{205} + \frac{6 i}{205} + \frac{14 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.3

Subtract $28$ from $3$ .

$[\begin{array}{c} \frac{- 25}{205} + \frac{6 i}{205} + \frac{14 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.2.4

Combine the numerators over the common denominator.

$[\begin{array}{c} \frac{- 25}{205} + \frac{20 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.3

Simplify each term.

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Step 16.3.1

Cancel the common factor of $- 25$ and $205$ .

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Step 16.3.1.1

Factor $5$ out of $- 25$ .

$[\begin{array}{c} \frac{5 (- 5)}{205} + \frac{20 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.3.1.2

Cancel the common factors.

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Step 16.3.1.2.1

Factor $5$ out of $205$ .

$[\begin{array}{c} \frac{5 \cdot - 5}{5 \cdot 41} + \frac{20 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.3.1.2.2

Cancel the common factor.

Step 16.3.1.2.3

Rewrite the expression.

$[\begin{array}{c} \frac{- 5}{41} + \frac{20 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.3.2

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{20 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.3.3

Cancel the common factor of $20$ and $205$ .

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Step 16.3.3.1

Factor $5$ out of $20 i$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{5 (4 i)}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.3.3.2

Cancel the common factors.

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Step 16.3.3.2.1

Factor $5$ out of $205$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{5 (4 i)}{5 (41)} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.3.3.2.2

Cancel the common factor.

$[\begin{array}{c} - \frac{5}{41} + \frac{5 (4 i)}{5 \cdot 41} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.3.3.2.3

Rewrite the expression.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & (\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.4

Expand $(\frac{3}{410} + \frac{7 i}{205}) (- 1 + 3 i)$ using the FOIL Method.

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Step 16.4.1

Apply the distributive property.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{3}{410} (- 1 + 3 i) + \frac{7 i}{205} (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.4.2

Apply the distributive property.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{3}{410} \cdot - 1 + \frac{3}{410} (3 i) + \frac{7 i}{205} (- 1 + 3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.4.3

Apply the distributive property.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{3}{410} \cdot - 1 + \frac{3}{410} (3 i) + \frac{7 i}{205} \cdot - 1 + \frac{7 i}{205} (3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5

Simplify and combine like terms.

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Step 16.5.1

Simplify each term.

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Step 16.5.1.1

Multiply $\frac{3}{410} \cdot - 1$ .

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Step 16.5.1.1.1

Combine $\frac{3}{410}$ and $- 1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{3 \cdot - 1}{410} + \frac{3}{410} (3 i) + \frac{7 i}{205} \cdot - 1 + \frac{7 i}{205} (3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.1.2

Multiply $3$ by $- 1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{- 3}{410} + \frac{3}{410} (3 i) + \frac{7 i}{205} \cdot - 1 + \frac{7 i}{205} (3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.2

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{3}{410} (3 i) + \frac{7 i}{205} \cdot - 1 + \frac{7 i}{205} (3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.3

Multiply $\frac{3}{410} (3 i)$ .

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Step 16.5.1.3.1

Combine $3$ and $\frac{3}{410}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{3 \cdot 3}{410} i + \frac{7 i}{205} \cdot - 1 + \frac{7 i}{205} (3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.3.2

Multiply $3$ by $3$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9}{410} i + \frac{7 i}{205} \cdot - 1 + \frac{7 i}{205} (3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.3.3

Combine $\frac{9}{410}$ and $i$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} + \frac{7 i}{205} \cdot - 1 + \frac{7 i}{205} (3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.4

Multiply $\frac{7 i}{205} \cdot - 1$ .

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Step 16.5.1.4.1

Combine $\frac{7 i}{205}$ and $- 1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} + \frac{7 i \cdot - 1}{205} + \frac{7 i}{205} (3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.4.2

Multiply $- 1$ by $7$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} + \frac{- 7 i}{205} + \frac{7 i}{205} (3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.5

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} + \frac{7 i}{205} (3 i) \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.6

Multiply $\frac{7 i}{205} (3 i)$ .

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Step 16.5.1.6.1

Combine $3$ and $\frac{7 i}{205}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} + \frac{3 (7 i)}{205} i \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.6.2

Multiply $7$ by $3$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} + \frac{21 i}{205} i \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.6.3

Combine $\frac{21 i}{205}$ and $i$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} + \frac{21 i i}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.6.4

Raise $i$ to the power of $1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} + \frac{21 (i^{1} i)}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.6.5

Raise $i$ to the power of $1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} + \frac{21 (i^{1} i^{1})}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.6.6

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} + \frac{21 i^{1 + 1}}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.6.7

Add $1$ and $1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} + \frac{21 i^{2}}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.7

Rewrite $i^{2}$ as $- 1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} + \frac{21 \cdot - 1}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.8

Multiply $21$ by $- 1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} + \frac{- 21}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.1.9

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} + \frac{9 i}{410} - \frac{7 i}{205} - \frac{21}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.2

To write $- \frac{21}{205}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} - \frac{21}{205} \cdot \frac{2}{2} + \frac{9 i}{410} - \frac{7 i}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.3

Write each expression with a common denominator of $410$ , by multiplying each by an appropriate factor of $1$ .

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Step 16.5.3.1

Multiply $\frac{21}{205}$ by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} - \frac{21 \cdot 2}{205 \cdot 2} + \frac{9 i}{410} - \frac{7 i}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.3.2

Multiply $205$ by $2$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{3}{410} - \frac{21 \cdot 2}{410} + \frac{9 i}{410} - \frac{7 i}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.4

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{- 3 - 21 \cdot 2}{410} + \frac{9 i}{410} - \frac{7 i}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.5

Simplify the numerator.

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Step 16.5.5.1

Multiply $- 21$ by $2$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{- 3 - 42}{410} + \frac{9 i}{410} - \frac{7 i}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.5.2

Subtract $42$ from $- 3$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{- 45}{410} + \frac{9 i}{410} - \frac{7 i}{205} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.6

To write $- \frac{7 i}{205}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{- 45}{410} + \frac{9 i}{410} - \frac{7 i}{205} \cdot \frac{2}{2} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.7

Write each expression with a common denominator of $410$ , by multiplying each by an appropriate factor of $1$ .

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Step 16.5.7.1

Multiply $\frac{7 i}{205}$ by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{- 45}{410} + \frac{9 i}{410} - \frac{7 i \cdot 2}{205 \cdot 2} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.7.2

Multiply $205$ by $2$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{- 45}{410} + \frac{9 i}{410} - \frac{7 i \cdot 2}{410} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.5.8

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{- 45}{410} + \frac{- 5 i}{410} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.6

Simplify each term.

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Step 16.6.1

Cancel the common factor of $- 45$ and $410$ .

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Step 16.6.1.1

Factor $5$ out of $- 45$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{5 (- 9)}{410} + \frac{- 5 i}{410} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.6.1.2

Cancel the common factors.

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Step 16.6.1.2.1

Factor $5$ out of $410$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{5 \cdot - 9}{5 \cdot 82} + \frac{- 5 i}{410} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.6.1.2.2

Cancel the common factor.

Step 16.6.1.2.3

Rewrite the expression.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & \frac{- 9}{82} + \frac{- 5 i}{410} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.6.2

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} + \frac{- 5 i}{410} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.6.3

Cancel the common factor of $- 5$ and $410$ .

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Step 16.6.3.1

Factor $5$ out of $- 5 i$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} + \frac{5 (- i)}{410} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.6.3.2

Cancel the common factors.

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Step 16.6.3.2.1

Factor $5$ out of $410$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} + \frac{5 (- i)}{5 (82)} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.6.3.2.2

Cancel the common factor.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} + \frac{5 (- i)}{5 \cdot 82} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.6.3.2.3

Rewrite the expression.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} + \frac{- i}{82} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.6.4

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ (\frac{3}{410} + \frac{7 i}{205}) (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.7

Expand $(\frac{3}{410} + \frac{7 i}{205}) (3 - i)$ using the FOIL Method.

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Step 16.7.1

Apply the distributive property.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{3}{410} (3 - i) + \frac{7 i}{205} (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.7.2

Apply the distributive property.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{3}{410} \cdot 3 + \frac{3}{410} (- i) + \frac{7 i}{205} (3 - i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.7.3

Apply the distributive property.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{3}{410} \cdot 3 + \frac{3}{410} (- i) + \frac{7 i}{205} \cdot 3 + \frac{7 i}{205} (- i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8

Simplify and combine like terms.

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Step 16.8.1

Simplify each term.

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Step 16.8.1.1

Multiply $\frac{3}{410} \cdot 3$ .

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Step 16.8.1.1.1

Combine $\frac{3}{410}$ and $3$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{3 \cdot 3}{410} + \frac{3}{410} (- i) + \frac{7 i}{205} \cdot 3 + \frac{7 i}{205} (- i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.1.2

Multiply $3$ by $3$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} + \frac{3}{410} (- i) + \frac{7 i}{205} \cdot 3 + \frac{7 i}{205} (- i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.2

Combine $\frac{3}{410}$ and $i$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{7 i}{205} \cdot 3 + \frac{7 i}{205} (- i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.3

Multiply $\frac{7 i}{205} \cdot 3$ .

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Step 16.8.1.3.1

Combine $\frac{7 i}{205}$ and $3$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{7 i \cdot 3}{205} + \frac{7 i}{205} (- i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.3.2

Multiply $3$ by $7$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} + \frac{7 i}{205} (- i) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.4

Multiply $\frac{7 i}{205} (- i)$ .

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Step 16.8.1.4.1

Combine $\frac{7 i}{205}$ and $i$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} - \frac{7 i i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.4.2

Raise $i$ to the power of $1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} - \frac{7 (i^{1} i)}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.4.3

Raise $i$ to the power of $1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} - \frac{7 (i^{1} i^{1})}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.4.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} - \frac{7 i^{1 + 1}}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.4.5

Add $1$ and $1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} - \frac{7 i^{2}}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.5

Rewrite $i^{2}$ as $- 1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} - \frac{7 \cdot - 1}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.6

Multiply $7$ by $- 1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} - \frac{- 7}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.7

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} - - \frac{7}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.8

Multiply $- - \frac{7}{205}$ .

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Step 16.8.1.8.1

Multiply $- 1$ by $- 1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} + 1 (\frac{7}{205}) & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.1.8.2

Multiply $\frac{7}{205}$ by $1$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} - \frac{3 i}{410} + \frac{21 i}{205} + \frac{7}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.2

To write $\frac{7}{205}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} + \frac{7}{205} \cdot \frac{2}{2} - \frac{3 i}{410} + \frac{21 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.3

Write each expression with a common denominator of $410$ , by multiplying each by an appropriate factor of $1$ .

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Step 16.8.3.1

Multiply $\frac{7}{205}$ by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} + \frac{7 \cdot 2}{205 \cdot 2} - \frac{3 i}{410} + \frac{21 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.3.2

Multiply $205$ by $2$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9}{410} + \frac{7 \cdot 2}{410} - \frac{3 i}{410} + \frac{21 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.4

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9 + 7 \cdot 2}{410} - \frac{3 i}{410} + \frac{21 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.5

Simplify the numerator.

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Step 16.8.5.1

Multiply $7$ by $2$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{9 + 14}{410} - \frac{3 i}{410} + \frac{21 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.5.2

Add $9$ and $14$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} - \frac{3 i}{410} + \frac{21 i}{205} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.6

To write $\frac{21 i}{205}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} - \frac{3 i}{410} + \frac{21 i}{205} \cdot \frac{2}{2} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.7

Write each expression with a common denominator of $410$ , by multiplying each by an appropriate factor of $1$ .

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Step 16.8.7.1

Multiply $\frac{21 i}{205}$ by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} - \frac{3 i}{410} + \frac{21 i \cdot 2}{205 \cdot 2} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.7.2

Multiply $205$ by $2$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} - \frac{3 i}{410} + \frac{21 i \cdot 2}{410} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.8.8

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & (\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i) \end{array}]$

Step 16.9

Expand $(\frac{3}{410} + \frac{7 i}{205}) (- 3 - 3 i)$ using the FOIL Method.

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Step 16.9.1

Apply the distributive property.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{3}{410} (- 3 - 3 i) + \frac{7 i}{205} (- 3 - 3 i) \end{array}]$

Step 16.9.2

Apply the distributive property.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{3}{410} \cdot - 3 + \frac{3}{410} (- 3 i) + \frac{7 i}{205} (- 3 - 3 i) \end{array}]$

Step 16.9.3

Apply the distributive property.

Step 16.10

Simplify and combine like terms.

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Step 16.10.1

Simplify each term.

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Step 16.10.1.1

Multiply $\frac{3}{410} \cdot - 3$ .

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Step 16.10.1.1.1

Combine $\frac{3}{410}$ and $- 3$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{3 \cdot - 3}{410} + \frac{3}{410} (- 3 i) + \frac{7 i}{205} \cdot - 3 + \frac{7 i}{205} (- 3 i) \end{array}]$

Step 16.10.1.1.2

Multiply $3$ by $- 3$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{- 9}{410} + \frac{3}{410} (- 3 i) + \frac{7 i}{205} \cdot - 3 + \frac{7 i}{205} (- 3 i) \end{array}]$

Step 16.10.1.2

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} + \frac{3}{410} (- 3 i) + \frac{7 i}{205} \cdot - 3 + \frac{7 i}{205} (- 3 i) \end{array}]$

Step 16.10.1.3

Multiply $\frac{3}{410} (- 3 i)$ .

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Step 16.10.1.3.1

Combine $- 3$ and $\frac{3}{410}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} + \frac{- 3 \cdot 3}{410} i + \frac{7 i}{205} \cdot - 3 + \frac{7 i}{205} (- 3 i) \end{array}]$

Step 16.10.1.3.2

Multiply $- 3$ by $3$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} + \frac{- 9}{410} i + \frac{7 i}{205} \cdot - 3 + \frac{7 i}{205} (- 3 i) \end{array}]$

Step 16.10.1.3.3

Combine $\frac{- 9}{410}$ and $i$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} + \frac{- 9 i}{410} + \frac{7 i}{205} \cdot - 3 + \frac{7 i}{205} (- 3 i) \end{array}]$

Step 16.10.1.4

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} - \frac{9 i}{410} + \frac{7 i}{205} \cdot - 3 + \frac{7 i}{205} (- 3 i) \end{array}]$

Step 16.10.1.5

Multiply $\frac{7 i}{205} \cdot - 3$ .

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Step 16.10.1.5.1

Combine $\frac{7 i}{205}$ and $- 3$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} - \frac{9 i}{410} + \frac{7 i \cdot - 3}{205} + \frac{7 i}{205} (- 3 i) \end{array}]$

Step 16.10.1.5.2

Multiply $- 3$ by $7$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} - \frac{9 i}{410} + \frac{- 21 i}{205} + \frac{7 i}{205} (- 3 i) \end{array}]$

Step 16.10.1.6

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} - \frac{9 i}{410} - \frac{21 i}{205} + \frac{7 i}{205} (- 3 i) \end{array}]$

Step 16.10.1.7

Multiply $\frac{7 i}{205} (- 3 i)$ .

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Step 16.10.1.7.1

Combine $- 3$ and $\frac{7 i}{205}$ .

Step 16.10.1.7.2

Multiply $7$ by $- 3$ .

Step 16.10.1.7.3

Combine $\frac{- 21 i}{205}$ and $i$ .

Step 16.10.1.7.4

Raise $i$ to the power of $1$ .

Step 16.10.1.7.5

Raise $i$ to the power of $1$ .

Step 16.10.1.7.6

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

Step 16.10.1.7.7

Add $1$ and $1$ .

Step 16.10.1.8

Rewrite $i^{2}$ as $- 1$ .

Step 16.10.1.9

Multiply $- 21$ by $- 1$ .

Step 16.10.2

To write $\frac{21}{205}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} + \frac{21}{205} \cdot \frac{2}{2} - \frac{9 i}{410} - \frac{21 i}{205} \end{array}]$

Step 16.10.3

Write each expression with a common denominator of $410$ , by multiplying each by an appropriate factor of $1$ .

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Step 16.10.3.1

Multiply $\frac{21}{205}$ by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} + \frac{21 \cdot 2}{205 \cdot 2} - \frac{9 i}{410} - \frac{21 i}{205} \end{array}]$

Step 16.10.3.2

Multiply $205$ by $2$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & - \frac{9}{410} + \frac{21 \cdot 2}{410} - \frac{9 i}{410} - \frac{21 i}{205} \end{array}]$

Step 16.10.4

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{- 9 + 21 \cdot 2}{410} - \frac{9 i}{410} - \frac{21 i}{205} \end{array}]$

Step 16.10.5

Simplify the numerator.

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Step 16.10.5.1

Multiply $21$ by $2$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{- 9 + 42}{410} - \frac{9 i}{410} - \frac{21 i}{205} \end{array}]$

Step 16.10.5.2

Add $- 9$ and $42$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{33}{410} - \frac{9 i}{410} - \frac{21 i}{205} \end{array}]$

Step 16.10.6

To write $- \frac{21 i}{205}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{33}{410} - \frac{9 i}{410} - \frac{21 i}{205} \cdot \frac{2}{2} \end{array}]$

Step 16.10.7

Write each expression with a common denominator of $410$ , by multiplying each by an appropriate factor of $1$ .

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Step 16.10.7.1

Multiply $\frac{21 i}{205}$ by $\frac{2}{2}$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{33}{410} - \frac{9 i}{410} - \frac{21 i \cdot 2}{205 \cdot 2} \end{array}]$

Step 16.10.7.2

Multiply $205$ by $2$ .

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{33}{410} - \frac{9 i}{410} - \frac{21 i \cdot 2}{410} \end{array}]$

Step 16.10.8

Combine the numerators over the common denominator.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{33}{410} + \frac{- 51 i}{410} \end{array}]$

Step 16.11

Move the negative in front of the fraction.

$[\begin{array}{c} - \frac{5}{41} + \frac{4 i}{41} & - \frac{9}{82} - \frac{i}{82} \\ \frac{23}{410} + \frac{39 i}{410} & \frac{33}{410} - \frac{51 i}{410} \end{array}]$