If $z = a + ib$, what is $z + \bar{z}$?
A$2a$
B$2ib$
C$a + b$
D$a^{2} + b^{2}$
Answer & Solution
Correct answer: A. $2a$
$(a + ib) + (a - ib) = 2a$. Imaginary parts cancel.
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