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# Edexcel C3 June 2016 - Unofficial Mark Scheme

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Why bother with a post grad course - waste of time? 17-10-2016
1. (Original post by That_other_guy)
I would think that's expanding it so you would lose a mark. I think it depends on the person whos marking it, if they're feeling geneours or not.
i think it's factorising (? i never knew these terms lol) i hope they'll give me that mark
2. (Original post by That_other_guy)
Guys for 8b I wrote 3/2 cotx instead of 3 cotx at the start and carried on with the wrong equation, do i lose all 6 marks? And what mark do you think for an A?
there are answer marks and method marks so if you got the right answer based on your wrong start, you'll get all the method marks. I'd say you'll get 3/6 or 4/6.

Probably 60-62/75 for an A
3. (Original post by Nimaribena)
I lost about 12/13 marks on really stupid mistakes, is it possible to make up for this in C4 to get an A*?
I'm in the same situation as you, your gonna have to get full ums in C4 and hope an A for C3 is atleast 62/75
4. (Original post by Nimaribena)
I lost about 12/13 marks on really stupid mistakes, is it possible to make up for this in C4 to get an A*?
im in the same situation as you, people are saying that 60-62 is an A so basically only by getting full marks in c4.....
5. (Original post by ajaxkiller)
im in the same situation as you, people are saying that 60-62 is an A so basically only by getting full marks in c4.....
I guess we had better get revising for C4... Good luck
6. (Original post by somevirtualguy)
The only thing I can think of is you must have also had e rather than e^-1, so it could change to:

-5ln(0.5+0.5e)
=5ln((0.5+0.5e)^-1)
=5ln(2+2e^-1)
ok thanks, how many marks would i loose for this do you think?
7. (Original post by lawlieto)
there are answer marks and method marks so if you got the right answer based on your wrong start, you'll get all the method marks. I'd say you'll get 3/6 or 4/6.

Probably 60-62/75 for an A
Ah thanks, I got the wrong answers, all those past papers and i end up making a stupid mistake, so fustrating. Hopefully i get like 2/6 for it
8. (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
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A. (20-4x^2)/(x^2+5)^2
B. >sqrt(5), <-sqrt(5)
Question 3
Spoiler:
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A. R= sqrt(5)
a= 26.57°
B. 33.0°, 273.9°
C. 86.1°
Question 4
Spoiler:
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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:
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i. 0.9463
ii. 0.5cosec(4Y)
Question 6
Spoiler:
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A. A=3, B=4
B. Normal eqn. -0.5x + 17.5
Question 7
Spoiler:
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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:
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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 full worked solutions : http://www.thestudentroom.co.uk/atta...7&d=1466526735
3c:
Attachment 554421
Can anyone remember the marks for each or any of the questions??
9. (Original post by Nimaribena)
I lost about 12/13 marks on really stupid mistakes, is it possible to make up for this in C4 to get an A*?
Yeah, it'll be hard though. Assuming you finish on 62-63/75 like you predict, that will most likely be 83-85 UMS (I doubt an A will be 62, more likely 60 as this paper was quite comparable to June 2014 in terms of difficulty).

So you'll need 70/75 on C4 to be in with a realistic chance... I would aim for full on C4 if you can, but I know how hard that is aha.
10. i don't find it's easy at all. what do you think about the grade boundaries for this?
11. What range of UMS would 63/67 out of 75 be?

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12. (Original post by guntaivanova)
i don't find it's easy at all. what do you think about the grade boundaries for this?
some people say around 62 whilst others go for something low like 59
so probably around 60-61 for an A then each grade is 6 marks above or below
13. Do you think I will get a mark on the arcsin question for
1)drawing the arcsin graph like as if it was flipped across the y axis
2)for the bit after that forming an equation writing down arcsin(X+1)=-pi/3
Or any marks for3) instead of finding the limits of X properly I did x>+-rt3 so basically attempting to solve itcheers
14. (Original post by Don Joiner)
What range of UMS would 63/67 out of 75 be?

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Probably low 80s to 90
15. I can't remember my answer for Q5 for some reason
16. What is the general agreed A* boundary that people think is likely?

I think 65

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17. hey for the 5 mark question where you had to find the equation of the normal, I attempted to find the gradient using the quotient rule but got it wrong, and I got the value of y wrong and so my equation wasn't correct either... how many marks out of 5 will i get ?
18. you'll be lucky if you get any marks if you answered the first part of that question correctly where there was a quartic expression divided by a quadratic and put it into the form asked for you should have been able to differentiate by first changing into a form suitable for differentiation involving terms with powers only then find x or y value by letting either = 0 unless they they provided it already in which case no need to equate to 0 .
19. (Original post by fefssdf)
hey for the 5 mark question where you had to find the equation of the normal, I attempted to find the gradient using the quotient rule but got it wrong, and I got the value of y wrong and so my equation wasn't correct either... how many marks out of 5 will i get ?
I believe the question was of the form ax^4+bx^3+cx^2+dx+e / ax^2 + bx + c
= Ax^2 + Bx + Cx+D/(x-2) ?
20. (Original post by jbaten)
I believe the question was of the form ax^4+bx^3+cx^2+dx+e / ax^2 + bx + c
= Ax^2 + Bx + Cx+D/(x-2) ?
yeh it was but I only got the value of A and B and not D, meaning i couldn't work out the gradient and thus the next 5 marks are going down the drain...

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