AQA Core 4 Exam Discussion 14/06/2012 !Poll, paper and unofficial MS (first post)!

when you say that you fail to realise that by parts is in fact a substitution of sorts, and also at a C4 level it will tend to be an integral that can only be done by one or the other.

How did everyone find this in comparison to their mock(jan12) and june 2011?

Would -4 < x < 4 be right for 3bii?

I understand this looking at things again, it just annoys me how many silly mistakes I've made.

Would an error at the beginning of the 8 marker stop me from getting method marks for the rest of the question?

I think Jan 12 was harder than this paper, it was very tricky but once you understood it, it worked -if that makes sense?

Although in comparison to this paper, June 11 was piss easy.


I think the main concern about this paper are silly mistakes, I think what it asked you to do was pretty clear but I don't know! (I know I made loads of silly mistakes which will cost me [dearly] despite all methods being correct, fml)

the core of WHAT I WAS TRYING TO SAY was that integrals can be solved by substitution and by parts. JUST BECAUSE SOMEONE DID IT BY PARTS AND ONE BY SUBSTITUTION does not necesarily mean somebody got it wrong. I did also acknowledge that one method is MORE SUITED TO ONE TYPE OF INTEGRAL than the other SO I DON'T GET WHAT YOU ARE TRYING TO SAY HUH?

Probably not- if a calculation slip then certainly not. If you started off down the wrong route- well then i'm not sure how you could complete the question so i assume you mean some sort of transcription error in which case you should be fine for all the method marks.

Its funny i (and some of the better people at maths i know) also thought jan was moderately harder than june 011, yet the grade boundaries indicate otherwise, strange.

techniqually, the easier way to do it was by substitution. IBP meant you had to use an substitution method as well anyway! might as well have use u = 2x-1 and be done with it.


so please, people stop arguing about method. Its maths, and maths can be done lots of different ways.




ps substitution FTW...

My feelings about this paper's grade boundaries:

I want it to be:


100ums - 65+ (like last year)
A* - 56
A - 53
B - 46


But it will most likely be:
100ums - 67/8
A* - 63
A - 56
B - 50

What do you guys think?

Perhaps I didn't do as badly as I thought!
My error was forgetting to divide one of my integrals by the derivative of the bit in brackets. It seems I got the rest of the working correct (I get the correct answer if I divide that term by 2 in every following line of working).

I think I've got about 50, I only gave myself 3/8 on the last question, I started going down the by parts question, evaluated my terms but didn't factorise it and collect it all, how much do you reckon? I thought by parts was the wrong route by that time and had other questions to finish

It's because doubles take in Jan and the singles take it in June -which would explain the super low grade boundaries last year!

What are your thoughts on that?

I didn't even think about IBP!!

Looked at it, saw the power and instantly boom, integration by substitution!


Despite this, I made a numerical error, fml!

ps substitution FTW...