But if you plug 1/x into the f(x) you do not get fg(x) so it must be wrong, to get from the f(x) to the fg(x) it had to be 1/(x^2), hence why gg(x)= x^4
I think as it was low marks it was just looking for the answer via inspection

Nah, 16x just means 16(g(x)) so to get 16/x g(x) has to be 1/x

Reply 607

Legend12345

for the volume of revolution did everyone get something like pi(ln3^3) - 2ln3 +1)

Reply 608

surreal123

Original post by ILuvAipomZ

SAME, like with the fractions and stuff the numbers i got are so close but theyre not the same lol ;-; i even think i got the trapezium rule question wrong, wot is lyf

mate there was no trapezium rule question. do you mean the simpsons rule? lol

Reply 609

ILuvAipomZ

Original post by surreal123

mate there was no trapezium rule question. do you mean the simpsons rule? lol

OH YEH thats what i meant, jesus xD then i really would have done it wrong lmao

Reply 610

hi-zen-berg

Original post by Pablo Picasso

Look, AQA will not drastically change the grade boundaries. If it was that hard, it wouldn't have been chosen for this year's paper. What they are trying to do, is stop thousands of student who simply do past papers and get A*s, without knowing the actual content. If this is one of you, you do not deserve to pass. The question about range, merely required simple mathematical ingenuity. Looking beyond this, the content was nothing but fundamental C3 AQA Maths knowledge.

d i c k h e a d ting

Reply 611

Pablo Picasso

Original post by JC25

When you realise you forgot the +C on the first integration by parts *sigh*

You should only lose one mark provided you integrated everything else correctly

Reply 612

Manliker

Original post by Pablo Picasso

The truth is that people won't all get 30 marks. Remember, you are competiting with private school students, and people who find maths naturally easy, like me.

Shut up you faggit

Reply 613

lulia276

what was question 7??

Reply 614

Cascadess

Original post by Pablo Picasso

The truth is that people won't all get 30 marks. Remember, you are competing with private school students, and people who find maths naturally easy, like me.

I think the boundaries will be lower, not drastically lower, but lower, maybe a few marks.

Reply 615

lucyjane_x

Original post by bartbarrow

Yes, you had to integrate in the first part

The second part asked for the integration of lnx * (lnx/x^2)

If you set u=lnx, then v' = lnx/x^2
so u'=1/x, v= (Answer to part a)

But how does integrating your answer to part a) get lnx/x^2
Wouldn't that be like integrating lnx/x^2 twice and getting lnx/x^2

(edited 7 years ago)

Reply 616

lollypop101

Original post by pablo picasso

the truth is that people won't all get 30 marks. Remember, you are competiting with private school students, and people who find maths naturally easy, like me.

loooooooooooool rah shut up why are u on this thread move man

Reply 617

CatherineJohnson

Original post by Pablo Picasso

If you were getting straight A*s as you allegedly claim, then this iteration should not appear difficult to you, unless you were not prepared. I don't see Oxbridge students apart from you here complaining.

Hi. I hold an offer from Oxford and I thought it was horrendous. Just Saying. I felt fully prepared going into the exam, but thought the paper was totally out of character. There were very few short answers and a much greater number of 6 and 7 markers that I would have expected, meaning it was hard to make up time. For the first time ever, I didn't have an excess of time to check through my answers and there were even answers I left blank.

Reply 618

Sam1231

Original post by bartbarrow

If you just ignore the second part and take 16x being transformed into 16/x, because that's all you need....

I think you're getting confused with your x's, they are not the same x.

When you take f(x) = 16x, fg(x) = 16 * g(x)

so 16 * g(x) = 16/x
so g(x) = 1/x