rearranging formulas

[clueless]

once its clicked you will be able to do them real easy

just always remember to do the same to each side

if you -10 on one side you -10 on the other

and its BODMAS backwards
and always do it step by step to save confusion!

[Jesus-Egg]

matrices row operations are awful.

huh? We've just been doing about matrices at uni, and the row operations are all fairly easy. What is it you find difficult?

[Soka]

huh? We've just been doing about matrices at uni, and the row operations are all fairly easy. What is it you find difficult?

I'm ok with inverse matrices, the addition/subtractions etc, and using the matrices algebra to solve equations (such as the common way to find solutions is AX^-1 = V). But I find it pointless, (I probably used the wrong word, difficult earlier) to solve equations using the row operations thing similiar to the simplex algorithm in D1.. its annoying in that when you do one row wrong with a simple slip on arithmacy the whole thing can go wrong and you have to start again. Also theres a much more efficient way to solve it by using the matrices algebra. We are talking about the same row operations here aren't we? Anyways what you using matrices for, as aren't you doing physics?

[Jesus-Egg]

Yeah, I know what you mean, it is really easy to make mistakes. I think we are talking about the same operations: swapping rows, multiplying rows by a constant, and replacing a row with itself plus a multiple of a different row. We've mainly been doing matrices to solve linear systems with lots of unknowns, but we've just done about determinants, and how you can use the determinant as an easy way to remember how to do the vector product. Yeah, i'm doing physics, but we have to do 2 maths modules this year, because there is quite a lot of maths involved in the physics. There's loads of calculus, vectors, etc

Oh, and I hated the simplex algorithm! I did AS further maths, and had to teach myself D1. There was this, and something else that I didn't really understand that well (can't remember what the other one was), and of course they both came up in the exam...

[Soka]

Yeah, I know what you mean, it is really easy to make mistakes. I think we are talking about the same operations: swapping rows, multiplying rows by a constant, and replacing a row with itself plus a multiple of a different row. We've mainly been doing matrices to solve linear systems with lots of unknowns, but we've just done about determinants, and how you can use the determinant as an easy way to remember how to do the vector product. Yeah, i'm doing physics, but we have to do 2 maths modules this year, because there is quite a lot of maths involved in the physics. There's loads of calculus, vectors, etc

Oh, and I hated the simplex algorithm! I did AS further maths, and had to teach myself D1. There was this, and something else that I didn't really understand that well (can't remember what the other one was), and of course they both came up in the exam...

Yeah, my brothers doing a Masters in Physics with Maths and he says he prefers the maths modules I think the maths modules will help the physics a great deal, I'm guessing there will be a lot of advanced calculus in physics. I can't think of anyone who does like the simplex algorithm lol. It comes up in the exam every year though because theres so little topics in D1 so everything practically comes up on the paper. D1 has now being shifted to D2 in the new specs. to make D1 easier apparently :rolleyes:. Of course, I would be doing D2 in June this year so I have to do Simplex again.

[Jesus-Egg]

haha, have fun! They're making D1 easier? It was already easy to begin with (apart from a couple of bits)! Anyway, yeah, the maths modules are better than the physics ones. We had collection exams when we got back after christmas, and in each exam you need 40% to pass. In the maths modules, most people did fairly well, but we got an email saying that in the physics exam 100 (out of 230) people failed! I'll find out what I got tomorrow in my tutorial, but i'm fairly confident i've passed. And yeah, there's lots of calculus, especially in classical mechanics. I hate moments of inertia! I mean, the formula's simple enough,

but you have to change variables, and if it's a strange shape it gets very confusing!

[clueless]

oh jeez your maths talk is alien to me and im meant to be doing it for a level next year!
sigh fun things to come eh?

[Jesus-Egg]

oh jeez your maths talk is alien to me and im meant to be doing it for a level next year!

Don't worry about it, A level math's isn't too bad. There are quite a lot of new things that you'll probably never have done before, such as differentiation, integration, logarithms, trig identies etc, which might be a bit confusing to start off with, but once you get the hang of them, they're ok.

sigh fun things to come eh?

Maths is always fun! unless it's the simplex algorithm

[cocaine]

guys, calm it, all i needed was a bit of GCSE maths help !!