Write the conjugate 
of the complex number z. Then find z
.z = 
+ 3i
A. 
= 
- 3i, z
= 3
B. 
= 
- 3i, z
= -3
C. 
= 
- 3i, z
= 21
D. 
= 
- 3i, z
= 15
Answer: D
Mathematics
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