Write in Standard Form (7+9i)/(1+i)

$\frac{7 + 9 i}{1 + i}$

Step 1

Multiply the numerator and denominator of $\frac{7 + 9 i}{1 + 1 i}$ by the conjugate of $1 + 1 i$ to make the denominator real.

$\frac{7 + 9 i}{1 + 1 i} \cdot \frac{1 - i}{1 - i}$

Step 2

Multiply.

Combine.

$\frac{(7 + 9 i) (1 - i)}{(1 + 1 i) (1 - i)}$

Simplify the numerator.

Expand $(7 + 9 i) (1 - i)$ using the FOIL Method.

Apply the distributive property.

$\frac{7 (1 - i) + 9 i (1 - i)}{(1 + 1 i) (1 - i)}$

Apply the distributive property.

$\frac{7 \cdot 1 + 7 (- i) + 9 i (1 - i)}{(1 + 1 i) (1 - i)}$

Apply the distributive property.

$\frac{7 \cdot 1 + 7 (- i) + 9 i \cdot 1 + 9 i (- i)}{(1 + 1 i) (1 - i)}$

Simplify and combine like terms.

Simplify each term.

Multiply $7$ by $1$ .

$\frac{7 + 7 (- i) + 9 i \cdot 1 + 9 i (- i)}{(1 + 1 i) (1 - i)}$

Multiply $- 1$ by $7$ .

$\frac{7 - 7 i + 9 i \cdot 1 + 9 i (- i)}{(1 + 1 i) (1 - i)}$

Multiply $9$ by $1$ .

$\frac{7 - 7 i + 9 i + 9 i (- i)}{(1 + 1 i) (1 - i)}$

Multiply $9 i (- i)$ .

Multiply $- 1$ by $9$ .

$\frac{7 - 7 i + 9 i - 9 i i}{(1 + 1 i) (1 - i)}$

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

$\frac{7 - 7 i + 9 i - 9 (i^{1} i)}{(1 + 1 i) (1 - i)}$

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

$\frac{7 - 7 i + 9 i - 9 (i^{1} i^{1})}{(1 + 1 i) (1 - i)}$

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

$\frac{7 - 7 i + 9 i - 9 i^{1 + 1}}{(1 + 1 i) (1 - i)}$

Add $1$ and $1$ .

$\frac{7 - 7 i + 9 i - 9 i^{2}}{(1 + 1 i) (1 - i)}$

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

$\frac{7 - 7 i + 9 i - 9 \cdot - 1}{(1 + 1 i) (1 - i)}$

Multiply $- 9$ by $- 1$ .

$\frac{7 - 7 i + 9 i + 9}{(1 + 1 i) (1 - i)}$

Add $7$ and $9$ .

$\frac{16 - 7 i + 9 i}{(1 + 1 i) (1 - i)}$

Add $- 7 i$ and $9 i$ .

$\frac{16 + 2 i}{(1 + 1 i) (1 - i)}$

Simplify the denominator.

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

Apply the distributive property.

$\frac{16 + 2 i}{1 (1 - i) + 1 i (1 - i)}$

Apply the distributive property.

$\frac{16 + 2 i}{1 \cdot 1 + 1 (- i) + 1 i (1 - i)}$

Apply the distributive property.

$\frac{16 + 2 i}{1 \cdot 1 + 1 (- i) + 1 i \cdot 1 + 1 i (- i)}$

Simplify.

Multiply $1$ by $1$ .

$\frac{16 + 2 i}{1 + 1 (- i) + 1 i \cdot 1 + 1 i (- i)}$

Multiply $- 1$ by $1$ .

$\frac{16 + 2 i}{1 - 1 i + 1 i \cdot 1 + 1 i (- i)}$

Multiply $1$ by $1$ .

$\frac{16 + 2 i}{1 - 1 i + 1 i + 1 i (- i)}$

Multiply $- 1$ by $1$ .

$\frac{16 + 2 i}{1 - 1 i + 1 i - i i}$

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

$\frac{16 + 2 i}{1 - 1 i + 1 i - (i^{1} i)}$

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

$\frac{16 + 2 i}{1 - 1 i + 1 i - (i^{1} i^{1})}$

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

$\frac{16 + 2 i}{1 - 1 i + 1 i - i^{1 + 1}}$

Add $1$ and $1$ .

$\frac{16 + 2 i}{1 - 1 i + 1 i - i^{2}}$

Add $- 1 i$ and $1 i$ .

$\frac{16 + 2 i}{1 + 0 - i^{2}}$

Add $1$ and $0$ .

$\frac{16 + 2 i}{1 - i^{2}}$

Simplify each term.

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

$\frac{16 + 2 i}{1 - - 1}$

Multiply $- 1$ by $- 1$ .

$\frac{16 + 2 i}{1 + 1}$

Add $1$ and $1$ .

$\frac{16 + 2 i}{2}$

Step 3

Cancel the common factor of $16 + 2 i$ and $2$ .

Factor $2$ out of $16$ .

$\frac{2 \cdot 8 + 2 i}{2}$

Factor $2$ out of $2 i$ .

$\frac{2 \cdot 8 + 2 (i)}{2}$

Factor $2$ out of $2 (8) + 2 (i)$ .

$\frac{2 (8 + i)}{2}$

Cancel the common factors.

Factor $2$ out of $2$ .

$\frac{2 (8 + i)}{2 (1)}$

Cancel the common factor.

$\frac{2 (8 + i)}{2 \cdot 1}$

Rewrite the expression.

$\frac{8 + i}{1}$

Divide $8 + i$ by $1$ .

$8 + i$

Write in Standard Form (7+9i)/(1+i)

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