Maths help please!

Jay Psi said:
Okay, it's been a few years, but are you sure about this? IIRC, raised indices are multiplicative, so (r^4)^(-2) = r^(4*-2) = r^(-8) = 1/(r^8).

If it was (r^4)*(r^-2) then the answer would be r^2 [as the OP had in 16 (b), where (q^5)*(q^3) = q^(5+3) = q^8]. Unless I've dropped a *BIG* one there :o

EDIT - These algebraic simplifications can be done on certain calculators, but I'm confident they're not allowed for your exams
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Of course it is, you're right. Why is it always the simple things that I get wrong:confused:
 
indices are tricky, but rules of thumb are:
(a^b) x (a^c) = a^(b+c)
(a^b)^c = a^(b x c)

If only we could do equations in posts it would make these threads so much easier!
 
HaMMuS said:
If only we could do equations in posts it would make these threads so much easier!
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I usually use LaTeX syntax when sending emails about maths problems but don't on here as mosy people who ask the questions probably have never heard of it.

The infrequency with which equations come up means that instead of having to learn syntax for any equation functionality it's probably quicker just to draw it in paint if it can't be understood in text though
 
They still give G grades :(

Seriously, how pathetic do you have to be to get a G at GCSE.. :/
I didn't fail, I got a G :cool:
 
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If the system hasn't changed.

Taking Higher Tier GCSE Maths; you only require 20% on Paper 1 & 2, to get a C.

40 = B, 60 = A, 80+ = A*
 
mjt said:
They still give G grades :(

Seriously, how pathetic do you have to be to get a G at GCSE.. :/
I didn't fail, I got a G :cool:
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Well in reality only A*-C grades are considered passes in the real world.

Haydz said:
If the system hasn't changed.

Taking Higher Tier GCSE Maths; you only require 20% on Paper 1 & 2, to get a C.

40 = B, 60 = A, 80+ = A*
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Thats also using grading on the curve where the raw mark is altered. So if it was a particularly easy or hard exam, they'd convert raw marks to get the correct amount of each type of grade. But obviously I'm sure everyone has heard about how they keep adding a 1/4 or 1/2 percent each year to the top grades.
 
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I remember answering questions totalling no more than 17 out of 45 on my maths P3 A level after they changed it to six modules.
I got an E, 43% :cool:
 
frying_pan_cat said:
I usually use LaTeX syntax when sending emails about maths problems but don't on here as mosy people who ask the questions probably have never heard of it.

The infrequency with which equations come up means that instead of having to learn syntax for any equation functionality it's probably quicker just to draw it in paint if it can't be understood in text though
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I understand LaTeX is the preferred method, but I really like the equation editor in Word 2007. It's most likely not as flexible or as efficient to use as LaTeX, but it's pretty intuitive and makes it very easy to write out fairly complicated expressions.

Although unecessary on these forums, it would be cool if there was a similiar system in others.
 
titaniumx3 said:
I understand LaTeX is the preferred method, but I really like the equation editor in Word 2007. It's most likely not as flexible or as efficient to use as LaTeX, but it's pretty intuitive and makes it very easy to write out fairly complicated expressions.

Although unecessary on these forums, it would be cool if there was a similiar system in others.
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There is, a lot of forums have inbuilt Latex code, so you can render some lovely equations..

..and Microsoft word, ewwwwwwwww :p:p Beautifully rendered tex documents >> all else for maths papers..just looks so much nicer
 
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