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# Edexcel C1 May 2018 retake unofficial markscheme watch

This mark scheme is now complete with the proper mark allocations made available thanks to begbie68!

Exam board: Edexcel

1a) 2*3^1/2 (two root three) (2)
b) 7/6 (3)

2a) 2x^3/2 - 3x^2 +4x +c (3)
b) i) 3x^-1/2 - 6
ii) 1/16 (4 total)

3) a) a=-5 b=-2 (2)
b) x=5+2^1/2 and x=5-2^1/2 (2)
c) p=27 q=10 r=2 ( 27 + 10root2 ) (2)

4a) £1680 (2)
b) Kim Andy question was N = 18 (5)

5) a) T.P at y=f(x-2) : (4/7) (1)
ii) Asymptote at y=f(-x) : y=1 again (1)
iii) f(2x) = (5/2, 0) ( thanks KEASTON101! ) (1)
b) K < or equal to 1, but also k = 7 ( thanks to Deathly_Vintage) as this is tangental to the maximum point! (2)

6) a) ( thanks jemimagoulding! ) a2 = 4/5, a3 = 4/9, a4=4/13 (3)
b) p = 4, q = -3, via simultaneous equations (2)
c) thus N = 81 (2)

7) a) (4)
b) -4<k<-5/2 (4)

8) straight line with curve question > gradient =5/4 (1)
line l2: y =5/4 x - 10 (3)
two co-ords (0-10), (8,0) (2)
area of parallelogram was 104u^2 (2)

9) a) f(x) = x^3 - 2x^2 -15x +36 (5)
b) (x-3)^2(x+a) >>> a was equal to 4 (3)
c) (4)

10) a) just the equation of the line (5)
b) co-ordinate B was ( 90, 333/10 ) (5)

If anyone has the missing questions please let me know so I can add them!
Furthermore if you believe any of these answers are wrong do not post on this forum, instead PM me as it is hard to manage replies on here!

If anyone is struggling with achieving any of these answers give me a shout and I'll help!
2. 1.)2sqrt3
2.)7/6
3.)x=1/16, 27+10sqrt2
From there on i have no idea what the order is
N=18 for the Kim and dude saving scheme
(x+A) A=4
a2=4/5, a3=4/9, a4=4/13, P=4, q=-3, n=81
k<1 and -4<k<(dunno which one was the numerator but -5/2) , dunno if this was a question f(2x) x=5/2
area =104 for parallelogram
B(90,100/3)
3. For f(2x) x=5/2
B was (90,333/10)
4. (Original post by ParagonPanda)
For f(2x) x=5/2
B was (90,333/10)
Oh yeah, youre right x=5/2,
5. what did you get for a1, a2 and a3 in that arithmetic sequence question
6. for the sequences question i think it was
a2= 4/5
a3= 4/9
a4=4/13
7. (Original post by jemimagoulding)
for the sequences question i think it was
a2= 4/5
a3= 4/9
a4=4/13
Yeah almost certain this is right, will add to list. Do you remember the pn+q values?
8. (Original post by jemimagoulding)
for the sequences question i think it was
a2= 4/5
a3= 4/9
a4=4/13
agreee
9. (Original post by ParagonPanda)
what did you get for a1, a2 and a3 in that arithmetic sequence question
a2=4/5
a3=4/9
a4=4/13
10. (Original post by ParagonPanda)
what did you get for a1, a2 and a3 in that arithmetic sequence question
a1=4/5
a2=4/9
a3=4/13
11. (Original post by raffoth)
Yeah almost certain this is right, do you remember the pn+q values?
P=4, Q=-3

one of the few questions i think i got full marks on
12. (Original post by raffoth)
Yeah almost certain this is right, will add to list. Do you remember the pn+q values?
p=4
q=-3
13. (Original post by jemimagoulding)
p=4
q=-3
(Original post by icanget_LOUD_too)
P=4, Q=-3

one of the few questions i think i got full marks on
I got this wrong, how did you do it?
14. (Original post by raffoth)
I got this wrong, how did you do it?
I used the values in part (a) to set up simultaneous equations and solved them that way
15. how did you work out p and q then I screwed that bit up so bad
16. P was 4. Q was -3 . So N was 81
17. (Original post by jemimagoulding)
for the sequences question i think it was
a2= 4/5
a3= 4/9
a4=4/13
Did it ask to simplify them?? I didn’t simplify a4
18. (Original post by raffoth)
Can't remember it all, so feel free to help out!

1a) 2*3^1/2 (two route three)
b) 7/6

2a) x = 1/16

3) 27+ 10(route two)

that's all I remember in terms of order, sorry!

Sequence question (thanks jemimagoulding) a2 = 4/5, a3 = 4/9, a4=4/13

pn+q >>> p = 4, q = -3

Kim Andy question was N =18

Very last question co-ordinate B was ( 90, 333/10)

K < or equal to 1,
-4<k<-5/2

(x-3)^2(x+a) >>> a was equal to 4

area of parallelogram was 104u^2 I think?

I don't think anything else was tricky (or at least my memory doesn't!) let me know if you agree or can add or at least add some structure to this!
****
19. (Original post by jessyoung24)
Did it ask to simplify them?? I didn’t simplify a4
20. What exam board is this for?

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