Answer:
B
Step-by-step explanation:
A conjugate is a term that has the same real part of its original but opposite terms of the second sign
Look at
[tex]3 + 6i[/tex]
The real part is 3 so B and C are the only possible answer.
The conjugate has the opposite sign of the second sign so the answer is
B
[tex]3 - 6i[/tex]
