Question

Which of the following is the conjugate of a complex number with 2 as the real part and 7i as the imaginary part? (5 points)

Answer 1

The complex conjugate of 7i is −7i The complex conjugate of a number 

z is a number with opposite imaginary part.

So if z=a+bi then conjugate is: ¯z=a−bi for any a,b∈R

We can note, that if we represent all complex numbers in coordinate system, then for any number: the number z and its conjugate ¯z are symetrical according to "real part" axis.