Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
If
z
−
1
z
+
1
\frac{z-1}{z+1}
z
+
1
z
−
1
is purely imaginary, then
∣
z
∣
|z|
∣
z
∣
is equal to a.
1
2
\frac{1}{2}
2
1
b. 1 c.
2
\sqrt{2}
2
d. 2
Browse the problem library