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Edexcel C2 20th May 2015 *Official Thread*

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Original post by LearningGeek
Thing i dont get is, of this is the last year to do this spec, then how are we supposed to retake next year?

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It isn't. The new maths spec starts in 2017 with first full A level exams in 2019.


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Original post by marsbar135
I got this also! I got gradient of tangent to be -1/3 and +11 too


nah it's confirmed the gradient was 0.5
sorry guys
i just cant blieve they made us do such a horrible paper
Original post by 14adeosuno
Guys surely 9b is £484 not £483 cos when you subbed in r as 2.9something it was £483.48 so they would need at least £484 to cover the cost fully as £483 will be to little to cover the cost as you would be 48p short
and
i don't think you would have to factorize k=4cos^2x +3cosx and it was only 3 marks and knowing 4sin^2x = 4(1-cos^2x) and then simplifying that is at least 2 marks and it was -4cos^2x -3cosx=-k and times that by -1 to get k=4cos^2x +3cosx should be the final accuracy mark, factorizing would need at least 2 marks because it wasn't simple


We went through a question like 9b in lessons, and apparently (for that year's exam anyway) they take both values, so either 483 or 484, because the paper did ask you for the nearest pound but they see the logic behind the 484 answer. But the paper definitely asked for the nearest pound.
Original post by jf1994
iirc they will still be setting AS exams next year, for people who want to retake.


Thank the lord for the blessing of retakes

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Reply 2665
Avatar for 09rkim
09rkim
Did anyone get -48 and -96 for A and B?
Can't remember which one was which
how did people find it ? i thought it was alright ! apaart from the last couple questikns not too bad at all ! feeling fairly happy
Anyone know how many marks and what the qs were for the circle one (Q2)
???
Original post by thehollowcrown
We went through a question like 9b in lessons, and apparently (for that year's exam anyway) they take both values, so either 483 or 484, because the paper did ask you for the nearest pound but they see the logic behind the 484 answer. But the paper definitely asked for the nearest pound.


both answers will be fine
Original post by 14adeosuno
Guys surely 9b is £484 not £483 cos when you subbed in r as 2.9something it was £483.48 so they would need at least £484 to cover the cost fully as £483 will be to little to cover the cost as you would be 48p short
and
i don't think you would have to factorize k=4cos^2x +3cosx and it was only 3 marks and knowing 4sin^2x = 4(1-cos^2x) and then simplifying that is at least 2 marks and it was -4cos^2x -3cosx=-k and times that by -1 to get k=4cos^2x +3cosx should be the final accuracy mark, factorizing would need at least 2 marks because it wasn't simple


where are you getting 3 cosx from
Based

•

on the comments of reputable users,
polling (and allowing for skew)


I am estimating 58/75 for 80UMS
(estimating 71 for full UMS)

come and vote on
http://www.thestudentroom.co.uk/showthread.php?t=3343941
over 480 students have already voted
Original post by kf141998
NOOOOOOO ****, i did sqrt 25 for the last one on my calculator even though i wrote cube root!


Samee omg same let's weep together
Guys if I got about 62/75 in C1, 35-40/75 (top kek) in C2 and get a perfect 75/75 in S1 how likely is it I get an A overall?


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Everyone being optimistic about the grade boundaries being low needs to get a reality check. Grade boundaries will 100 percent not be lower than 61 for an A. This exact thing happened last year, people signed petitions and ****. The papers for every subject are getting harder. Last year I flopped but since I've done c3 and c4 this was a walk in the park and many other A2 students would agree therefore boosting the grade boundaries.
I think Arsey gave up. I don't think there will be an unofficial markscheme lol😊


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Original post by xxxhabashibaxxx
yes someone , please explain , need help on this too. what did you do op


Just realised you can just put it into quadratic formula,

as in -b+-root(b^2 - 4ac)...
Original post by 09rkim
Did anyone get -48 and -96 for A and B?
Can't remember which one was which

yes yes yes !!!! :biggrin:
Original post by m_sweets
First I drew a cylinder to make it easier for me. Volume = 75pi
75pi = pi r^2 times y
y= 75pi/pi r^2
y=75/r^2

surface area = 3(2pi.r^2) + 2(pi2ry)
=6pi r^2 + 4pi ry
=6pi r^2 + 4pi r(75/r^2)
=6pi r^2 + 300pi/r
From what i remember


Thank you, not sure why I couldn't do that, I think I looked at the question and panicked.
My answers (as far as I remember):
Q1) 1024 - 1280x + 720x^2
2.a) (x-2)^2 + (y+1)^2 = 20
b) x - 2y - 14 = 0
3.a) B-A = 48 (show that)
b) A = -96, B = -48
c) 3(2x+1)(x+4)(x-4)
4.a) Used cosine rule to show = 0.906
b) 40.9
c) 96.7
5.a) r = 8/9
b) a = 18
c) n = 28
6.a) 4x^5/2 - 10x^2 + C
b) 226
7.i) 0.264 (Vague memory of this)
ii) y = 3/2 and y = 1/3
8.i) pi/9, 4pi/9, 7pi/9
ii.a) k = 1+- sqrt (1+16k) / 8
ii.b) x = 0, 138.6, 221.4
9.a) Show that question (find h from value for V sub into formula for SA)
b) C = £483
c) d^2C/dr^2 = 12pi + 600/r^3 is greater than 0 as r = cube root 25 ---> Minimum
Original post by xxxhabashibaxxx
where are you getting 3 cosx from

the trig question i cant remember what it was but i did k=... and left it like that i didnt factorise, does that lose marks?

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