Question

Simplify. i3 A) 1 B) -1 C) i D) -i E) -3i

Answer 1

`\huge\boxed{D)\ -i}`

Explanation:

We know:

`i=√(-1)\to i^2=-1`

therefore

`i^3=i\cdot i\cdot i=i^2\cdot i=-1\cdot i=-i`