Greetings , I was solving a list of practice exercises when I got to this question, and I quite can't understand what to do about it. Could you please help me?
this is the question
Being a a real number and the imagnary part of the complex number zero, so a is:
(2+i)/(a+2i)
a)-4
b)-4
c)1
d)2
e)4
I appreciate the time you took.
Thank you.