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# Edexcel C3,C4 June 2013 Thread watch

1. how do you work out a question if it said find ff(x), like the question in the C3 paper january 2013 q)3)a)
Hey guys, I was just wondering if I was aiming for an A*, is it worth doing C3/C4 solomon papers? This has probably been asked to death, but I've seen a lot of mixed replies! And if it is worth doing, should I do all or just some?
i've done the C3 papers, and honestly it has made me a lot more confident with the weaker parts in C3 for me, so if you have a topic you are weak at, look through for it in the soloman papers, dont waste your time on question you 100% know you can do. then do some exam papers as they will give you a hint of what the real exam is like.
3. (Original post by masryboy94)
i've done the C3 papers, and honestly it has made me a lot more confident with the weaker parts in C3 for me, so if you have a topic you are weak at, look through for it in the soloman papers, dont waste your time on question you 100% know you can do. then do some exam papers as they will give you a hint of what the real exam is like.
Hmm yeah good idea, I've always thought doing all of the questions was a bit long winded...I think I'll just pick out questions from now on. Thanks
4. (Original post by masryboy94)
how do you work out a question if it said find ff(x), like the question in the C3 paper january 2013 q)3)a)
It means the function of the f(-3), so first find f(-3); f(-3) means the y-value when x=-3, which it gives you as it tells you point P is (-3,0), so f(-3)=0.

So you're finding f(0) (the y value when x=0) which it also gives you as it tells you point Q is (0,2). Therefore ff(-3)=2.

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5. Elmwood papers are probably the most difficult, they can be found here: http://www.london-oratory.org/maths/
6. (Original post by AVB)
It means the function of the f(-3), so first find f(-3); f(-3) means the y-value when x=-3, which it gives you as it tells you point P is (-3,0), so f(-3)=0.

So you're finding f(0) (the y value when x=0) which it also gives you as it tells you point Q is (0,2). Therefore ff(-3)=2.

Posted from TSR Mobile
ahhh okayy brilliantly explained, thank you
7. Does anyone know if we're supposed to know how to use the factor formulae thing?
8. (Original post by nukethemaly)
Does anyone know if we're supposed to know how to use the factor formulae thing?
You don't need to, no, but I strongly recommend that you learn it (it's not that hard anyway). It can be very useful for some questions.
9. Can someone help me out with a question:
How would you differentiate (8-x)lnx
I did: 8lnx-xlnx and got: 8/x - lnx - 1, why is this wrong? I used the product rule on xlnx and just differentiated 8lnx like how you would normally.

This is from C3 January 2011 question 5b
10. (Original post by usycool1)
You don't need to, no, but I strongly recommend that you learn it (it's not that hard anyway). It can be very useful for some questions.
But it isn't going to come up?
11. (Original post by usycool1)
You don't need to, no, but I strongly recommend that you learn it (it's not that hard anyway). It can be very useful for some questions.
pretty sure you were a guy?
12. (Original post by nukethemaly)
But it isn't going to come up?
you might need it for integration, you never know with Edexcel they might put a nasty question
13. (Original post by nukethemaly)
But it isn't going to come up?
You don't need to learn it, you can just derive it from the formulae in the formulae booklet should you need it for some reason.
14. (Original post by nukethemaly)
But it isn't going to come up?
no guarantee but I really hope not
alongside arctanx, arcsinx etc
15. (Original post by MedMed12)
no guarantee but I really hope not
alongside arctanx, arcsinx etc
ah I hate that, I'm planning on doing every question in the textbook on that section tomorrow!
Can someone help me out with a question:
How would you differentiate (8-x)lnx
I did: 8lnx-xlnx and got: 8/x - lnx - 1, why is this wrong? I used the product rule on xlnx and just differentiated 8lnx like how you would normally.

This is from C3 January 2011 question 5b
can someone help me with this question?
you might need it for integration, you never know with Edexcel they might put a nasty question
Oh dear I thought it was C3?
18. (Original post by nukethemaly)
ah I hate that, I'm planning on doing every question in the textbook on that section tomorrow!
blergh i dont have time with bio and chem :/ might examsolutions it
can someone help me with question?
Yeah sure, give me a second to do it on a piece of paper and then i'll attach the solution
20. (Original post by MedMed12)
blergh i dont have time with bio and chem :/ might examsolutions it
ah same, I still have about 6 more exams, 4 of which are chemistry and biology! But I'm really hoping to get an A* in Maths so I'm not gonna risk anything!

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