Question

Simplify i31

Answer 1

31i? o.o

Answer 2

1

−1

−i

i

Answer 3

Are you sure your question is "simplify i31"? because it's i*31 which is 31i.

here's a guide:
i = the square root of -1
i^2 = -1
i^3 = -i
i^4 = 1