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Edexcel C3 June 2016 - Unofficial Mark Scheme

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1. How many marks would I lose if I did the long division incorrect. Second part finding the normal equation was reliant on first part
2. (Original post by Inayah03)
You will probably lose 1-2 marks..you'll receive mostly method marks

Posted from TSR Mobile
thanks! made a stupid c1 mistake :/
3. First question I got 28/X-2 but j didn't put it equal to the other function ffs. I then got X to be 30 zzz how many marks was that question? Guess I'll only lose 1 or 2 for it
4. (Original post by Sarah12344466)
How many marks would I lose if I did the long division incorrect. Second part finding the normal equation was reliant on first part
Its okay you will receive method marks. They award marks if you use the right method but carry an error forward. Just as long as you've got your method right, you'll defo receive decent amount of marks

Posted from TSR Mobile
5. what do we think will be the grade boundaries?
6. Will I only lose 1 mark to putting 2 and not 1/2 on q 5 ii
7. How many working marks do you think i would get on Q2b.) for finding a range using an incorrect dy/dx found in part a? and how many marks would i loose on question 9c.) for leaving as T= -5ln(1/2/(1+e^-1))
8. Can anybody remember the questions for 5i and ii?
9. (Original post by HarshaPeed)
Nope it was 1/2.
i disagree
10. from what I can see...I got 66/75 - an A* do we think - or just under? Doesn't matter to an extent because I always knew I'd have to well in C4 for an A* but yeah would be nice to have some sort of idea
11. (Original post by veldt127)
I'm not 100% sure on all of these, but I think most are correct.

Question 1
Spoiler:
Show
A. -5, 6
B. 6
Question 2
Spoiler:
Show
A. (20-4x^2)/(x^2+5)^2
B. >sqrt(5), <-sqrt(5)
Question 3
Spoiler:
Show
A. R= sqrt(5)
a= 26.57°
B. 33.0°, 273.9°
C. 86.1°
Question 4
Spoiler:
Show
Ai. 21
ii. ln(2.5)
iii. 25
B. Show that question
C. 1.4368, 1.4373
D. Show the root was in [1.4365, 1.4375]
Question 5
Spoiler:
Show
i. 0.9463
ii. 0.5cosec(4Y)
Question 6
Spoiler:
Show
A. A=3, B=4
B. Normal eqn. -0.5x + 17.5
Question 7
Spoiler:
Show
A. graph of arcsin, sort of a rotated S shape. Went through (0,0), (-1,-pi/2), (1,pi/2)
B. -1-0.5sqrt(3)
Question 8
Spoiler:
Show
A. Trig proof
B. -2.848, -1.277, 0.294, 1.865
Question 9
Spoiler:
Show
A. 6.740 - dose after 4 hours
B. show that dose equalled a value after 7 hours
C. 5ln(2 + 2e^-1)
A = 5, B = 2
PDF with working for 1-4 and 9 : http://www.thestudentroom.co.uk/atta...5&d=1466508775
For question 2 thought it wanted dy/dx<0.
12. (Original post by chloeabeki)
wasn't it between pi and -pi? or was it pi/2?
Pretty sure was -pi/2 and pi/2
13. what were the marks for each Q?
14. (Original post by veldt127)
I'm not 100% sure on all of these, but I think most are correct.

Question 1
Spoiler:
Show
A. -5, 6
B. 6
Question 2
Spoiler:
Show
A. (20-4x^2)/(x^2+5)^2
B. >sqrt(5), <-sqrt(5)
Question 3
Spoiler:
Show
A. R= sqrt(5)
a= 26.57°
B. 33.0°, 273.9°
C. 86.1°
Question 4
Spoiler:
Show
Ai. 21
ii. ln(2.5)
iii. 25
B. Show that question
C. 1.4368, 1.4373
D. Show the root was in [1.4365, 1.4375]
Question 5
Spoiler:
Show
i. 0.9463
ii. 0.5cosec(4Y)
Question 6
Spoiler:
Show
A. A=3, B=4
B. Normal eqn. -0.5x + 17.5
Question 7
Spoiler:
Show
A. graph of arcsin, sort of a rotated S shape. Went through (0,0), (-1,-pi/2), (1,pi/2)
B. -1-0.5sqrt(3)
Question 8
Spoiler:
Show
A. Trig proof
B. -2.848, -1.277, 0.294, 1.865
Question 9
Spoiler:
Show
A. 6.740 - dose after 4 hours
B. show that dose equalled a value after 7 hours
C. 5ln(2 + 2e^-1)
A = 5, B = 2
PDF with working for 1-4 and 9 : http://www.thestudentroom.co.uk/atta...5&d=1466508775
for 3c how did you get 86.1??
15. I think I'm the only student who doesn't remember their answers after an exam. #LongTermMemoryProblems
16. How do I see the unofficial mark scheme?
17. (Original post by Natalie Premru)
How do I see the unofficial mark scheme?
Go to the start of this thread
18. Wasn't 5 i 0.25arctan(0.75)? Which is around 0.1608 in radians?
19. (Original post by veldt127)
I'm not 100% sure on all of these, but I think most are correct.

Question 1
Spoiler:
Show
A. -5, 6
B. 6
Question 2
Spoiler:
Show
A. (20-4x^2)/(x^2+5)^2
B. >sqrt(5), <-sqrt(5)
Question 3
Spoiler:
Show
A. R= sqrt(5)
a= 26.57°
B. 33.0°, 273.9°
C. 86.1°
Question 4
Spoiler:
Show
Ai. 21
ii. ln(2.5)
iii. 25
B. Show that question
C. 1.4368, 1.4373
D. Show the root was in [1.4365, 1.4375]
Question 5
Spoiler:
Show
i. 0.9463
ii. 0.5cosec(4Y)
Question 6
Spoiler:
Show
A. A=3, B=4
B. Normal eqn. -0.5x + 17.5
Question 7
Spoiler:
Show
A. graph of arcsin, sort of a rotated S shape. Went through (0,0), (-1,-pi/2), (1,pi/2)
B. -1-0.5sqrt(3)
Question 8
Spoiler:
Show
A. Trig proof
B. -2.848, -1.277, 0.294, 1.865
Question 9
Spoiler:
Show
A. 6.740 - dose after 4 hours
B. show that dose equalled a value after 7 hours
C. 5ln(2 + 2e^-1)
A = 5, B = 2
PDF with working for 1-4 and 9 : http://www.thestudentroom.co.uk/atta...5&d=1466508775
does anyone remember the fraction for 6? i dont remember my answer
20. (Original post by tigermoth890)
For question 2 thought it wanted dy/dx<0.
It did. dy/dx is positive from -sqrt(5) to sqrt(5)

Graph of dy/dx:
https://www.desmos.com/calculator/ngz0g28xf5

Graph of y=f(x)
https://www.desmos.com/calculator/bys8keuq2r

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