Hey guys. So, complex numbers. Its been a while since I've dealt with them. I've been wondering a few things about them. When expressed in the form a + ib, is there a particular way that you square them? And when you have a rational number, with an i term on the bottom, how exactly do you go about simplifying it into non rational form? Cheers guys. I'm fairly rusty when it comes to the complex numbers. Hope this will clear some things up for me. I need to be fairly sharp at them now that I'm doing Physical Optics.