Question

Find the complex conjugate z1 of z1 = -1 +5i.

Answer 1

When we have a number z:

$z=a+bi$

The complex conjugate will be:

$z^{\ast}=a-bi$

We change the sign of the number next to the i.

In this case, we have:

$z_1=-1+5i$

So, for the complex conjugate, we need to change the sign of the 5.

And the result will be:

$z^{\ast}_1=-1-5i_{}$

Answer:

-1-5i