Recent content by chickensagan

Thanks for the reply Oli4, but I still don't get it. I don't understand how they factorise it when both sides don't have 2 as a common factor, and even if that happened how does the -2 end up inside the bracket?

Please may someone explain the last step of this proof for me? I can't see how it's done algebraically. Where does the second (x1-x2) go? Is it a mistake? I've tried multiplying out -2 and everything else I could think of but to no avail. Thank you.

Thanks for the reply goldsax. I can't seem to find a definitive explanation of the unified model. This is my understanding so far: The unified model is the theory that all AGN have a black hole at their centre which is fuelled by its surrounding accretion disk, and that differences between...

Cosmic greetings, I am reading up on active galaxies, and 'strong' and 'broad' emission lines are mentioned everywhere, yet no definitions given. Do they mean that the object is emitting energy across a large part of the spectrum, or that it's emitting a lot of energy? Also, I am confused...

Sorry I should have said. I've done some googling and looked at a few websites and books. My understanding so far is that they are galaxies which are emitting abnormal amounts of electromagnetic radiation, which some astrophysicists think is caused by a black hole at the centre of said...

Dear all, I'm a first year undergraduate student and I've been set an essay on the title of the post. I would be very grateful if someone could explain in layman's terms what these things are, and also if someone could tell me where I can find more information on them, preferably in an...

Hi everyone, I'm trying to work out if my calculator (Casio FX-911ES PLUS) is allowed in my uni exams but I'm a noob to calculators (I'm on a foundation course!) Here's the description of allowed calculators: "students are allowed to use noiseless, non-mains, single-line display...