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# Edexcel C2 20th May 2015 *Official Thread* watch

1. (Original post by C2 MAY 20)
Nobody cares that you study more maths

What are you trying to do? Impress us?

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lol i dont even know what those things are either
2. (Original post by C2 MAY 20)
Essentially you can change the base of the loagarithm to whatever you want

And so to solve a log equation which has different bases, just change one of the log bases and then you'll have the same bases
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So how would you do log8(x) + 3logx(4) = 9 be? Im a bit confused...
3. (Original post by El-Presidente)
You mean Computer Science? My sixth form doesn't do IT. (Idk if you just called it that because its easier or you actually do ICT).

I'm doing AQA.
Ok, no I'm doing ICT thought u were too, no problem though
4. (Original post by Oz_Vessalius)
make sure you know your proofs for geometric convergence and your fourier transformations for trig questions involving sine i've heard they've been tipped to come up this year
oh and also you need to understand how the cayley-hamilton theorem works
Hey. maybe you can stop trolling us and help us with our questions?
5. What are the formulas and equation that need to be learnt for C2?
6. (Original post by naxiv)
The C2 June 2015 paper has been leaked
Do you actually know or just spreading around the rumour like everyone else?
7. (Original post by Oz_Vessalius)
make sure you know your proofs for geometric convergence and your fourier transformations for trig questions involving sine i've heard they've been tipped to come up this year
oh and also you need to understand how the cayley-hamilton theorem works
OMG I have never heard of these, didn't even know they were on the spec, can you explain them to me briefly so I know it for tomorrow as I need to learn the basics not the complex parts as I will forget
8. (Original post by Craig1998)
But please don't do it again unless you've finished the first go-over.
And therein lies my mistake on C1... I spent too long checking my answers so I had to rush the end of the paper and made more mistakes than I would have otherwise :P I really wish I could redo the paper, since I know I could have done much better than I actually did on it
9. as its f(K) you sub in k for the x values, the second bracket is k-k which equals 0.. 0 times the other bracket is 0, meaning youre left with the -8
10. (Original post by lukass)
So how would you do log8(x) + 3logx(4) = 9 be? Im a bit confused...
log8(x) + 3log8(4)/log8(x) = 9

(log8(x))^2 + 3log8(4) = 9log8(x)

then rearrange factorise if you can and solve or just quadratic formula
ie. (log8(x))^2 - 9log8(x) + 3log8(4) = 0
use quadratic formula to find log8(x)
then get rid of logs and you are done

(Original post by ozzie2)
OMG I have never heard of these, didn't even know they were on the spec, can you explain them to me briefly so I know it for tomorrow as I need to learn the basics not the complex parts as I will forget
lol didnt think anyone would actually believe me deleted now
11. This logggg!! how on earth should be done!
Attached Images

12. can someone help me on part c
Attached Images

13. (Original post by Columbo97)
I don't know about anyone else but I'm feeling a lot more confident for this C2 paper than the C1!!

Hopefully we can help anyone with any queries!
Na c1 was piss easy this year core 2 going to be a killer
14. Can somebody please explain what chapter 8, "graphs of trig. functions is all about" and what we need to know from that topic. do questions come up just on that one topic alone or are they mixed with trig identities?
thanks
15. (Original post by studentwiz)
can someone help me on part c
I did it this way. Find the angle NAB, do 90 minus this angle. Split ABP into two triangles. Now to find AP you do 6/cos(90-NAB). You get 6 from halving 12.

Sorry I would post a picture to make it clearer but I can't
16. (Original post by lukass)
as its f(K) you sub in k for the x values, the second bracket is k-k which equals 0.. 0 times the other bracket is 0, meaning youre left with the -8
Thanks.

https://c4a3f001dcd45afe69d0ceec8300...%20Edexcel.pdf

For Q6) whenever they ask you if it's a diameter do you use that formula?
And can you help me with: 6c, q8b and 9a
17. (Original post by userxx990)
This logggg!! how on earth should be done!
ab=25

so a=25/b

sub that into your log equation then you should find b then sub into ab=25 to find a
18. (Original post by userxx990)
This logggg!! how on earth should be done!
From the log rules, the left side can be rewritten as log4(a/b) and right can be written as log4(64)

Then you remove the logs so it is now a/b=64
x both sides by B so a=64b
Now sub a=64b into the first equation
64b(b)=25
64b^2=25
Root both sides
8b=5
b=5/8

Then sub in b=5/8 into the first equation
a(5/8)=25
a=40

Tell me if I am wrong but that's what I thought of doing
19. (Original post by Tizzydag)
Can somebody please explain what chapter 8, "graphs of trig. functions is all about" and what we need to know from that topic. do questions come up just on that one topic alone or are they mixed with trig identities?
thanks
you only need to sort of understand what those graphs are but you dont need to remember them. its nice to have an idea of what they are but you dont need to; just remember how to use one solution to an equation to get the rest - ie. 2pi - theta for cos, pi - theta for sin, theta + 2pi for both of them and theta + pi for tan
20. Anyone got a list of all of the formula's we need to know?

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