Simplify ii

$i i$

Multiply $i i$ .

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

$i^{1} i$

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

$i^{1} i^{1}$

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

$i^{1 + 1}$

Add $1$ and $1$ .

$i^{2}$

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

$- 1$