Simplify (6-3i)^2

${(6 - 3 i)}^{2}$

Step 1

Rewrite ${(6 - 3 i)}^{2}$ as $(6 - 3 i) (6 - 3 i)$ .

$(6 - 3 i) (6 - 3 i)$

Step 2

Expand $(6 - 3 i) (6 - 3 i)$ using the FOIL Method.

Apply the distributive property.

$6 (6 - 3 i) - 3 i (6 - 3 i)$

Apply the distributive property.

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

Apply the distributive property.

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

Step 3

Simplify and combine like terms.

Simplify each term.

Multiply $6$ by $6$ .

$36 + 6 (- 3 i) - 3 i \cdot 6 - 3 i (- 3 i)$

Multiply $- 3$ by $6$ .

$36 - 18 i - 3 i \cdot 6 - 3 i (- 3 i)$

Multiply $6$ by $- 3$ .

$36 - 18 i - 18 i - 3 i (- 3 i)$

Multiply $- 3 i (- 3 i)$ .

Multiply $- 3$ by $- 3$ .

$36 - 18 i - 18 i + 9 i i$

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

$36 - 18 i - 18 i + 9 (i^{1} i)$

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

$36 - 18 i - 18 i + 9 (i^{1} i^{1})$

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

$36 - 18 i - 18 i + 9 i^{1 + 1}$

Add $1$ and $1$ .

$36 - 18 i - 18 i + 9 i^{2}$

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

$36 - 18 i - 18 i + 9 \cdot - 1$

Multiply $9$ by $- 1$ .

$36 - 18 i - 18 i - 9$

Subtract $9$ from $36$ .

$27 - 18 i - 18 i$

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

$27 - 36 i$