logo

Ask Questions, Get Answers

X
 

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) $(z+a)^2$

1 Answer

Toolbox:
  • $z\overline z=|z|^2$
$(z+a)(\overline z+a)=(z+a)\overline {(z+a)}$
$=|z+a|^2$
answered Jul 28, 2013 by rvidyagovindarajan_1
 

Related questions

...