Guest Session: 1 Question Remaining.
Create Account
to save progress.
Login
Complex Numbers
medium
0:00.0
Simplify
−
4
\sqrt{-4}
−
4
.
A
2
i
2i
2
i
B
−
2
i
-2i
−
2
i
C
Both
2
i
2i
2
i
and
−
2
i
-2i
−
2
i
D
Undefined in reals
Submit Answer