How to conjugate this complex number

[From: ] [author: ] [Date: 13-01-21] [Hit: ]

Example:
normal, z=a+ib ; conjugate, z'=a-ib
what is the normal is 3i? How to conjugate it?

z = 3i = 0 + 3i. so a = 0 and b = 3
z'=a-ib = 0 - 3i = -3i

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