Question

Pleaz explain how question no. 4 is done?
File attached:

Answer 1

I want to know that how he wrote \[-3\sqrt{3}+3=z=-3\sqrt{3}+3i\]

Answer 2

hmm... idk... could be a typo..
you're talking about line 2 right?

Answer 3

yes!

Answer 4

there is a typo on the first line
it should be
\[-3\sqrt{3}+3i\]

Answer 5

K! thanx:)