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# C2 unofficial answers

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1. (Original post by Einstein101)
I got that aswel!!! But apparently its b = (a-5)/9 :/
yeah that's the same thing, just with a common denominator
2. (Original post by AstarAstarA)
Geometric:
b) 256
c) 1.602

Binomial:
A = 16
k = 7/2
B = 936

Integration:
S = 24.3

Trapezium:
a) 7
b) 20.75
c) R = 5.75

Factor theorem:
a) 5
c) (x + 2)(3x + 2)(2x - 1)

Differentiation(Q10):
a) 1/3PIx^2
d) Minimum = 120m
c) x = 16.63... => f''(x) = 0.437 > 0

Trig identities:
a) Theta = 8/15Pi , -2/15Pi
b) x = 194.5, 345.5

Circle:
a) root(34)
c) 3x + 5x - 95 = 0

Log:
i) (a - 5)/9
ii) -2.19

Likely UMS:

68 - A
57 - B
49 - C
41 - D
36 - E
U
Do you mean 68/75 marks for an A??? That would be very high wouldnt it? Or is that UMS?
3. (Original post by LewisClothier)
yeah that's the same thing, just with a common denominator
okayyy phewwwwww
4. (Original post by Isabellagoodwinx)
That's weird because I got the c1 mark scheme the day of the exam, I don't mean the actual mark scheme I mean one a teacher has done
Unfortunately Arsey, who releases these unofficial mark schemes, posted earlier he will not continue to release theme as Edexcel do not which for any unofficial mark scheme to be viewed online. However these answers here seem correct enough.
5. what do you reckon 90 ums is going to be as a raw mark???
6. (Original post by LewisClothier)
yeah that's the same thing, just with a common denominator
would you get all the marks if you left it as a=9b+5
7. (Original post by richpanda)
i got -2.19.

anyone get 9b+5 for a in terms of b?
Yes I got -2.19 and I also got 9b + 5 for a in terms of b but the question asked for b in terms of a.
8. (Original post by eftio.gea)
Guys wasn't part a of Q9 = 1/3pi(x^2)????

because the sector area is 1/2r^2(theta)
which is 1/2(x^2)(2/3pi)

= 2/6pi(x^2)
= 1/3pi(x^2)
??
Yeh I agree
9. My guess at boundaries:

Full UMS - 74
90 UMS - 69
80 UMS - 63 A
70 UMS - 54 B
10. how did you get -2/15pi
11. (Original post by izrael25)
how did you get -2/15pi
When you rearranged you got cos(theta - pi/5) = 1/2

Cos-1(1/2) = pi/3, -pi < theta < pi

So solutions were pi/3, -pi/3

but then you had to add pi/5 to get the right solutions of 8/15 pi and -2/15 pi
12. Arsey where you at?
13. (Original post by isaac_wood_)
It depends on where they allocate marks, if its A1 (answer) marks it has to be the correct answer so you would drop one mark on showing its a minimum but they coule put ECF. I imagine you will lose 2/3 marks on d) because 2/3 marks will be A1/2/3 marks, perhaps 2 for differentiation correctly and another for the correct final answer. If you are lucky you will drop 3 marks if not it could be 4/5
Thank you! I think I got in the region of 69-71, so happy with that.
14. (Original post by oinkk)
For the binomial my friend and I got B = -1008?
Same
15. (Original post by Einstein101)
I got that aswel!!! But apparently its b = (a-5)/9 :/
Im not sure if you are joking, thats the same thing just expanded
16. (Original post by richpanda)
i got -2.19.

anyone get 9b+5 for a in terms of b?
wasn't it b in terms of a??!!
17. (Original post by Ekssss_)
Same
It was 1944 - 1008 to get 936. Perhaps a method mark for finding 1008 though.
18. (Original post by iMacJack)
When you rearranged you got cos(theta - pi/5) = 1/2

Cos-1(1/2) = pi/3, -pi < theta < pi

So solutions were pi/3, -pi/3

but then you had to add pi/5 to get the right solutions of 8/15 pi and -2/15 pi
i forgot about the -1/3pi
19. What exam board is this
20. How many marks was the two last binomial expansion questions? Finding k and B?

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