Question

which of the following is equal to $i^3$?
1
-1
$i$
$-i$

Explanation:

Step1: Rewrite $i^3$ as product

$i^3 = i^2 \times i$

Step2: Substitute $i^2=-1$

$i^3 = -1 \times i$

Step3: Simplify the expression

$i^3 = -i$

Answer:

$-i$