Question

Need help with the question in the picture learned awhile ago and forget!

Answer 1

-i

Explanation:

i^15

Divide the exponent by 4

15/4 = 3 r 3

Take the remainder and use as the exponent

i^3

We know that i^2 = -1

i^3 = i^2 *i

i^3 = -1*i

-i