Simplify -i*(-i)

$- i \cdot (- i)$

Step 1

Multiply $- i (- i)$ .

Multiply $- 1$ by $- 1$ .

$1 i i$

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

$1 (i^{1} i)$

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

$1 (i^{1} i^{1})$

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

$1 i^{1 + 1}$

Add $1$ and $1$ .

$1 i^{2}$

Multiply $i^{2}$ by $1$ .

$i^{2}$

Step 2

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

$- 1$