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# Edexcel C4 June 2016 - Unofficial Markscheme

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1. (Original post by AJtheconfusedcat)
for 8a if you write it in vector form u lose the mark because they asked for coordinates
Not true, they gave the 'coordinates' of P in column vector form
2. (Original post by k.russell)
swear the 8c is 2 rt 2 not 2?
the modulus was 2rt2 yes

But it said in the question it is "krt2" so k has just been given as 2
3. (Original post by Student403)
the modulus was 2rt2 yes

But it said in the question it is "krt2" so k has just been given as 2
aha ok, I think I wrote 2 rt 2 hope that's ok lol
4. How many marks was part b) of question 3 and how many marks were allocated for each part in question 7 ?
5. (Original post by k.russell)
swear the 8c is 2 rt 2 not 2?
yeah it was 2 root 2 . The question said exoress in the form k root 2 , so that just means the k bit was 2
6. Has anyone got question 7 anywhere, I did 512pi - integral from 17/2 to 1/2 of part a
7. (Original post by k.russell)
swear the 8c is 2 rt 2 not 2?
yeah same
8. What do you think the grade boundaries will be?
9. For the volume one I got 512-1024/5 not 544-1024/5, I know what I got wrong but how many marks would I get? (Also how many marks was the question)
10. Oh god i thought it gone really well but now i think it didn't
11. (Original post by Don Pedro K.)
Y = (2x-1)^(3/4) I believe?
I'm thinking I had the fraction as 1/10 rather than 1/5, but that would give me an answer that was way off, and I seem to be closer to the answer. Hopefully I'm just forgetting what I wrote and got it right.
12. guys how many marks do you think i would lose if i left the differential equationss in terms of ln and x . Also forgot to cancel 8pi/6 to 4pi/3
13. (Original post by coolguy123456)
For the volume one I got 512-1024/5 not 544-1024/5, I know what I got wrong but how many marks would I get? (Also how many marks was the question)
Lose 2.
14. (Original post by NotNotBatman)
I'm thinking I had the fraction as 1/10 rather than 1/5, but that would give me an answer that was way off, and I seem to be closer to the answer. Hopefully I'm just forgetting what I wrote and got it right.
15. Anyone know how many marks I'd lose if I accidentally did the cos(piy) and differentiated correctly but I forgot it was y and differentiated like it was X, so didn't do it implicitly. This made my dy/dx wrong and hence the next bit of the question wrong?
16. hi can anyone help show me where im going wrong for 3b please?

Never mimd worked it out... gradient if normal is wrong!!
17. (Original post by Mattematics)
Lose 2.
Thanks, also for the last one I got area as 3.2 cause I did 1/2absinc using 2root2 =a=b and Accidental used angle as 0.8 from part above
Instead of 0.6, any marks out of 2? Or lost those 2 as well?
18. How many marks were for each question pleasee especially Q3B,4B ,7C
19. change in my mood after seeing this tbh
20. Anyone have the marks for each question?

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