Browse Questions

# If $z$ is a complex number and $a$ is real, then $(z+a)(\overline z+a)=?$

(A) $|z+a|$

(B) $z^2+a^2$

(C) $|z+a|^2$

(D) $(z+a)^2$

Can you answer this question?

Toolbox:
• $z\overline z=|z|^2$
$(z+a)(\overline z+a)=(z+a)\overline {(z+a)}$
$=|z+a|^2$
answered Jul 28, 2013