CSCA Compass
EN
RU
Back to Topics
Complex Numbers
Practice
0
Math
1 / 25
Difficulty:
All (25)
Easy (15)
Medium (20)
Hard (15)
Question 1 of 25
Easy
0:00 / 1:20
0 answered · 0 correct
i² =
A. 1
B. i
C. −i
D. −1
Previous
Next