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Edexcel A2 C4 Mathematics June 2016 - Official Thread

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Does anyone know if they usually give you certain formula in questions such as "find the rate of change of the volume of this cone"? or do I need to know all the volume formula?
Original post by Gitty
has anyone done the june 2016 C34 IAL paper yet - this exam was 2 days ago? The C3 questions in it were very similar to the ones that we had on our paper. Maybe with a bit of luck we may have similar C4 questions that were on that paper..


I'm going to do it now, only the c4 bits of course. Hopefully we get lucky.
For an integration question, if its ask for an exact value you give it as a decimal how many marks do u get
Original post by Lilly1234567890
guys you know when they ask you to 'use your approximation to estimate an approximate value of blah blah and you have to find X. how do you find x.? for example, ques 4b here:

http://qualifications.pearson.com/content/dam/pdf/A%20Level/Mathematics/2013/Exam%20materials/6666_01R_que_20130618.pdf

(7100)^1/3 = (7.1)^1/3 * (1000)^1/3 = 10 (7.1^1/3) [Law of surds]
7.1 = 8 - 9x, x = 0.1

Plug in this value of x into your expansion and voila, an approximation.

Edit: just noticed the mod x limitation.
(edited 7 years ago)
So you're looking for 7100^1/3, but you need to remember that mod x < 8/9

So you need to realise that you should find the value of x to give the cube root of 7.1, (which gives x=0.1), and then multiply your estimate by 10 to give the cube root of 7100:

(7100)^1/3
=(7.1x1000)^1/3
=1000^1/3 x 7.1^1/3
=10 x 7.1^1/3

Edit: Hopefully the person that asked sees this, not sure why it didn't quote 🙄
(edited 7 years ago)
Anyone else always make stupid mistakes? Like I just did a 9 marker and would have got it right, but I wrote sec^2x down and then next line changed it so sin^2x

Anyone have any tips on how to avoid making these sort of mistakes?
Is there a link to the IAL paper for this year? I'd like to have a go at the C4 parts for some new material!
Original post by NotNotBatman
I'm going to do it now, only the c4 bits of course. Hopefully we get lucky.


where can you get the paper?
Original post by Don Pedro K.
I just figured it out haha xD Thanks anyway :smile:!


wait why didnt AB.BC work? also what year was that from?
http://www.thestudentroom.co.uk/showthread.php?t=4181092
Original post by AlannahK
Is there a link to the IAL paper for this year? I'd like to have a go at the C4 parts for some new material!


http://www.thestudentroom.co.uk/showthread.php?t=4181092

here's the link:smile:
Original post by raman_17
where can you get the paper?


http://www.thestudentroom.co.uk/showthread.php?t=4181092
Original post by ccharlie97
No you wouldn't have to! But it would be easier to do algebra with (1,2,4) rather than (6,12,24) - it's just the value of λ \lambda will be different in r=a+λb r = a + \lambda b


but you can use (6,12,24) right? because in Q7 of this paper I got wrong answer using the this method.

http://www.madasmaths.com/archive/iygb_practice_papers/c4_practice_papers/c4_m.pdf
Original post by maruchan


Thank you! Good luck for tomorrow :smile:
Original post by maruchan


thank you very much............... ready for c4??
Original post by AlannahK
Thank you! Good luck for tomorrow :smile:


Good luck to you too!!:biggrin:
Original post by M&F
but you can use (6,12,24) right? because in Q7 of this paper I got wrong answer using the this method.

http://www.madasmaths.com/archive/iygb_practice_papers/c4_practice_papers/c4_m.pdf


You wouldn't have the got wrong answer any of the direction vectors parallel to (1,2,4)! All you'd get is a different value of λ \lambda ! Try it again if it didn't work :smile:
Original post by raman_17
thank you very much............... ready for c4??


yes! Are you ready? Good luck:smile:
image.jpegCan someone help me with this question please! How do u re arrange the diff eqn
Original post by maruchan
yes! Are you ready? Good luck:smile:


nearly there............... just gotta do this paper (obviously c4 parts) and read some maths notes. Thanks....... likewise :biggrin:

by the way how did u find c3??
Original post by raman_17
nearly there............... just gotta do this paper (obviously c4 parts) and read some maths notes. Thanks....... likewise :biggrin:

by the way how did u find c3??


It was OK. What do you think's going to come up tomorrow? Hopefully it'll be a nice paper! btw how did you find the c3?:wink:

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