Basic Math Examples

$(- 2 - i) (- 6 + 2 i)$

Step 1

Expand $(- 2 - i) (- 6 + 2 i)$ using the FOIL Method.

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Step 1.1

Apply the distributive property.

$- 2 (- 6 + 2 i) - i (- 6 + 2 i)$

Step 1.2

Apply the distributive property.

$- 2 \cdot - 6 - 2 (2 i) - i (- 6 + 2 i)$

Step 1.3

Apply the distributive property.

$- 2 \cdot - 6 - 2 (2 i) - i \cdot - 6 - i (2 i)$

Step 2

Simplify and combine like terms.

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Step 2.1

Simplify each term.

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Step 2.1.1

Multiply $- 2$ by $- 6$ .

$12 - 2 (2 i) - i \cdot - 6 - i (2 i)$

Step 2.1.2

Multiply $2$ by $- 2$ .

$12 - 4 i - i \cdot - 6 - i (2 i)$

Step 2.1.3

Multiply $- 6$ by $- 1$ .

$12 - 4 i + 6 i - i (2 i)$

Step 2.1.4

Multiply $- i (2 i)$ .

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Step 2.1.4.1

Multiply $2$ by $- 1$ .

$12 - 4 i + 6 i - 2 i i$

Step 2.1.4.2

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

$12 - 4 i + 6 i - 2 (i^{1} i)$

Step 2.1.4.3

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

$12 - 4 i + 6 i - 2 (i^{1} i^{1})$

Step 2.1.4.4

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

$12 - 4 i + 6 i - 2 i^{1 + 1}$

Step 2.1.4.5

Add $1$ and $1$ .

$12 - 4 i + 6 i - 2 i^{2}$

Step 2.1.5

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

$12 - 4 i + 6 i - 2 \cdot - 1$

Step 2.1.6

Multiply $- 2$ by $- 1$ .

$12 - 4 i + 6 i + 2$

Step 2.2

Add $12$ and $2$ .

$14 - 4 i + 6 i$

Step 2.3

Add $- 4 i$ and $6 i$ .

$14 + 2 i$