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# Edexcel C4 Monday 25th January 2010 (AM) watch

1. Hey guys,

This is the last maths exam for me and I couldn't see a topic so I made one.

Hows everyone feeling about the exam ?

Personally I've been concentrating more on the other modules so I'm expecting to find it hard.

Although I'm pretty good at most things apart from Vectors.

So I'm probably just gona revise the key points from the heinemann book on vectors and hope for like a 6 mark question on finding the point of interception or something
2. Only integration and past paper questions to go,
3. i think im going to get a U
4. i'm pretty confident, except if there's an obscure vector one...
5. whats the grade boundary, usually?
6. (Original post by AyonFazal)
Well I know that in the June 08 paper it was 57/75 for an A, but i think it may well be something like 57 for an A* this time around considering how difficult C3 was.
7. (Original post by Optimu\$)
Well I know that in the June 08 paper it was 57/75 for an A, but i think it may well be something like 57 for an A* this time around considering how difficult C3 was.
I found C3 difficult too, I'm resitting and really struggle with Vectors. I hope this goes okay
8. Vectors is all I can do, the rest sucks. I really need like 90 something % though,

I'm just gonna spend all day on Solomons...
9. (Original post by Optimu\$)
Well I know that in the June 08 paper it was 57/75 for an A, but i think it may well be something like 57 for an A* this time around considering how difficult C3 was.
You haven't even seen the paper, how would you know?

Look how easy C3 was last summer and how hard C4 was. Just because C3 had some tricky questions this month doesn't mean C4's going to be a killer. We have no idea what the paper's like...
10. How do you know when you're supposed to use integration by substitution? I've been watching these tutorials and he suddenly used it. I'm so confused
11. (Original post by Josieee)
How do you know when you're supposed to use integration by substitution? I've been watching these tutorials and he suddenly used it. I'm so confused
When you need integration by substitution they will almost always give you the substitution in the question.

"Use the substitution u=whatever to solve:"
12. in a question I just did on EdExcel C4 Jan 07 it was used to get the volume?
13. (Original post by Josieee)
in a question I just did on EdExcel C4 Jan 07 it was used to get the volume?
Question 2?

Why would you use substitution there?
14. (Original post by HitTheSwitch)
Question 2?

Why would you use substitution there?

That's what the tutorial said to do. That's why I got confused?
15. (Original post by Josieee)

That's what the tutorial said to do. That's why I got confused?
He uses substitution to make it easier I think, you don't have to use substitution there if you don't want to. I did it by recognition because I find it more simple but you can solve it in a few ways. I think If they definitely want you to use substitution they will probably tell you. Thats just the inpression I get, I'm not 100% sure...
16. (Original post by HitTheSwitch)
He uses substitution to make it easier I think, you don't have to use substitution there if you don't want to. I did it by recognition because I find it more simple but you can solve it in a few ways. I think If they definitely want you to use substitution they will probably tell you. Thats just the inpression I get, I'm not 100% sure...
How would you use recognition?
17. Use partial fractions to split it up, should be relatively straightforward from there.
18. (Original post by Josieee)
How would you use recognition?

Sorry, don't know LateX or whatever that stuff is.
19. (Original post by HitTheSwitch)

Sorry, don't know LateX or whatever that stuff is.

Thank you that totally makes sense to me thank you so much
20. also how do you know it's not gunna turn out to be ln(1+2x)^2 ? I think I've totally confused myself.

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