Question

If i = sqrt-1, what is the value of i^3
a. -1
b. i
c. 1
d. -i

Answer 1

I think it's D. it's been awhile since I've done those, though

Answer 2

We can think about it like this:
We know how powers work, and anything to the third power is equal to multiplying by itself 3 times.
We will apply this Idea
i^3=i(i)(i)
i^3=i(i^2)
i^3=i(-1)
i^3=-i
The answer is D.