Question

help.
how does i^18 = -1?

Answer 1

i^18 = (i^2)^9 = (-1)^9 = -1

Answer 2

thank you! :)

Answer 3

Also:
\[\LARGE i^1=\sqrt{-1}\]
\[\LARGE i^2=-1\]
\[\LARGE i^4=\sqrt{1}\]
\[\LARGE i^3=-i\]

Answer 4

And as we see, 18 is a factor of 2, so it would be the i^2

Answer 5

thanks for the help