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Edexcel C4 June 2016 - Unofficial Markscheme

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1. (Original post by Don Pedro K.)
We wanted volume not area
Yeah that's what I meant sorry, volume as 512 and then the other thing as 1024/5
2. for Question 6, on the prove that the integral = k (integral) sin^x i got 1/8 (integral) sec^2x.

Where did i go wrong??

and how many marks would i get for part B for carrying the k = 1/8 instead of using k=8?
3. (Original post by Sapereaude54)
Lol, lost all 5 marks on that question...shame
Also for the value of lambda that I obtained was 32, I know this is wrong know but everything else I got was correct.
Do you think the error will be carried forward to the next question.
I believe this was the last question on the paper,
Also, can you edit your comment and add: [spoiler] [ /spoiler] (without the space on the second one) around my working out please?
4. what UMS is 71 or 72 /75 going to be for this?
5. (Original post by Student403)
Interesting.

I wrote because mod l2's direction = 5sqrt2 and we want lengths of +-2sqrt2, then we must multiply the line equation direction by factors of +-2/5
I guess that works aswell? Was you able to get the required answers?
6. (Original post by edothero)
I believe this was the last question on the paper,
Also, can you edit your comment and add: [spoiler] [ /spoiler] (without the space on the second one) around my working out please?
Sorry for the confusion, I meant the lambda value integration question.
7. (Original post by edothero)
I guess that works aswell? Was you able to get the required answers?
Yeah of course. I came out of the exam wondering why that was worth 5 marks
8. How many marks is q3? Differentiated it right but rearranged it completely wrong and therefore got part b entirely wrong.. how many marks would i lose?
9. Wasn't the volume question done by finding the volume under the big rectangle and taking it away from the volume under the curve?
10. Will I get method marks for 8D) (Area question), if i had cos(theta)= -1/5 and that lead to the wrong area?
11. does anyone have the questions and/or workings|?
12. (Original post by Mattematics)
Pretty sure every answer is now correct. Enjoy

Question 1:
Spoiler:
Show

Question 2:
Spoiler:
Show

Question 3:
Spoiler:
Show
Question 4:
Spoiler:
Show

Question 5:
Spoiler:
Show
Question 6:
Spoiler:
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Question 7:
Spoiler:
Show
Question 8:
Spoiler:
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cos(theta) was 4/5. Left it out by mistake.
for 8a if you write it in vector form u lose the mark because they asked for coordinates
13. For the last one of last question did people get +- 2/5 for lamda?
14. (Original post by AJtheconfusedcat)
for 8a if you write it in vector form u lose the mark because they asked for coordinates
thats not true, mark schemes usually accept either.
15. for Q7(c) I did :

Volume =pi X integral (between 17/2 and 1/2) 8 dx - pi X integral (between 17/2 and 1/2) y^2 dx

So for the volume of the cylinder the limits should have been 17/2 and 0 (not 1/2).
So my answer ended up being :

Volume = 544pi - 32pi - 1024pi/5

How many marks do you think I'll lose.

Overall though paper was decent. Only marks I think I lost were this one and last question on 8
16. (Original post by Student403)
Yeah of course. I came out of the exam wondering why that was worth 5 marks
It was odd to say the least.
17. swear the 8c is 2 rt 2 not 2?
18. If I put '10 hours and 33 minutes' for question 4, would I get all the marks? Thanks for the unofficial mark scheme by the way- really helpful
19. (Original post by coolguy123456)
For the last one of last question did people get +- 2/5 for lamda?
i did but somehow only got one of the coordinates correct.
i got (-1 5 4) and (3 3.4 0.8)

can someone tell me my mistake thx
20. wait wasnt the ditance 2 root 2 for AP?

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