Maths help!

Lakeland

Lakeland

Lakeland

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Joined
1 Nov 2005
Posts
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Would anyone mind helping me get my head round these equations?

scan10001.jpg


They're part of a warm up for a course I start in sep't.

Any help would be great :)
 
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Sorry, can't help you out. This is the best I can do...

+ = A
- = A

Therefore....D/D...Double D = FAP FAP!
 
What is the question? these are just equations, first one to do with motion, the other one I'm not sure, diffraction?
 
anant_shah94 said:
In which case I think I'd do it like this:

divide both sides by 2pi

t/2pi = root(w/gf)

then square both sides

(t/2pi)^2 = w/gf

g(t/2pi)^2 = w/f

(g(t/2pi)^2)/w = f
Click to expand...

Surely that is breaking some law isn't it? It's been a while since I did A-level Maths, but I thought that was a fundamental mistake.

To get w/gf on the right you have to times root(w/gf) by root(w/gf). Where as you have timesed the right by root(w/gf) and the left by t/2pi.
Unless root(w/gf) = t/2pi then it's wrong?
 
They are pretty straight forward. Just do stuff the both sides until it looks right, as anant_shah94 said.

Another way of thinking about it is moving terms from one side to the other and reversing them in the process. The first one starts of with the 2Pi multiplying on the right hand side, it can just be moved to the left side by remembering it must then divide. Same with plus becoming minus, square route becoming square etc...
 
Nope, it's correct. You need to eliminate the root from the 'f' side in order to make it further workable. Remember that whatever is done to one side of the equation must be done to the other also.
 
OzyOly said:
Surely that is breaking some law isn't it? It's been a while since I did A-level Maths, but I thought that was a fundamental mistake.

To get w/gf on the right you have to times root(w/gf) by root(w/gf). Where as you have timesed the right by root(w/gf) and the left by t/2pi.
Unless root(w/gf) = t/2pi then it's wrong?
Click to expand...

I've always been taught to square both sides

eg 3 = root (12-3)

you square both sides and get

9 = 12 - 3
 
OzyOly said:
Surely that is breaking some law isn't it? It's been a while since I did A-level Maths, but I thought that was a fundamental mistake.

To get w/gf on the right you have to times root(w/gf) by root(w/gf). Where as you have timesed the right by root(w/gf) and the left by t/2pi.
Click to expand...

It's fine, think about it in simple numbers:

3 = SQRT(9)

Square both sides gives us:

3^2 = 9

Unless root(w/gf) = t/2pi ...
Click to expand...
Bingo! ;)
 
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anant_shah94 said:
I've always been taught to square both sides

eg 3 = root (12-3)

you square both sides and get

9 = 12 - 3
Click to expand...

Fair enough, I stand corrected. Just goes to show that British education is pretty worthless. I got over 90% at Alevel maths (guess that's an A* these days?). :p
 
OzyOly said:
Fair enough, I stand corrected. Just goes to show that British education is pretty worthless. I got over 90% at Alevel maths (guess that's an A* these days?). :p
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Yep :p

I came out of my maths gcse really upset last november. results came: 93% :o
Same for core1, I think I've done quite badly, but I'm expecting to get over 90%. maths is something that has generally come really easily to me, I quite enjoy the subject. And it boils my pee when I hear people say "I hate maths. It's the worst subject" :mad:
 
For the first equation, look at "f" and then think about the individual operations that are being carried out on it, from start to end:

1) f is multiplied by g, to get gf

2) The reciprocal of gf is taken to get 1/gf

3) 1/gf is multiplied by w to get w/gf

4) The square root of w/gf is taken to get sqrt(w/gf)

5) sqrt(w/gf) is multiplied by 2*Pi to get 2*sqrt(w/gf)

Hence to get back to step 1, with f on its own, you simply work backwards from step 5 and do the opposite in each step, e.g. the first thing I'd do is divide both sides by 2*Pi.
 
anant_shah94 said:
Yep :p

I came out of my maths gcse really upset last november. results came: 93% :o
Same for core1, I think I've done quite badly, but I'm expecting to get over 90%. maths is something that has generally come really easily to me, I quite enjoy the subject. And it boils my pee when I hear people say "I hate maths. It's the worst subject" :mad:
Click to expand...

Core 1&2 are easy. 3 can be a bit tricky and 4 is easy too. It's all practice. I you practice lots, you'll get perfect at it, if you're out of practice you'll find it hard (like me. :p ).
 
anant_shah94 said:
You found it hard and got 90% :p
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Oh no, I found Alevel maths easy. I'm just very out of practice, I've not done any maths that I couldn't type in a calculator since 2007.

In my degree it's all logic and automata, there is no real maths involved. I'm sure I could teach myself it again, though I doubt I'd have as much luck with reteaching myself physics and chemi. :P
 
Maths is a piece of cake :D so far at least, I managed A*'s in my mocks that we hadn't even learnt everything about, so an A* is pretty much a given for GCSE. Not sure how I'm going to go on with maths and further maths at A-Level, but we'll see :D
 
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