# Edexcel Maths A level Core 1 Unofficial Markscheme May 15th 2019Watch

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Thread starter 6 days ago
#1
C1 EDEXCEL 2019 UNOFFICIAL MARKSCHEME

1a) 63
1b) 5+2root 6
2) 32-4c, c=5 so sum of first 4 terms= 140
3) proof that the curve and line dont intersect- b^2-4ac<0, cant square root a negative value(-7)
4)intergration- c= 8/9
5)diferentiation question when d^2y/dx^2 = 9, value was 44 i think?
6)equation of line gradient was -3/2??, lenght was root 13 t=7/4, and i got something dumb for the area
7) arithmentic series q- 400,8000, d=12, 17th year for jack- 208
8) graph intersection question where gradient is eqaul/ parallel idk point b- (3,9), point c- (-3,1)
9) graph q pretty straight forward, had to remeber to add in y and x intercepts
k=-4, a was 1

Cant remember one of the qs lol

(Original post by Yolotwice)
This is the AS paper C1 Edexcel May 15th
2
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6 days ago
#2
(Original post by sdx47x)
C1 EDEXCEL 2019 UNOFFICIAL MARKSCHEME

1a) 63
1b) 5+2root 6
2) 32-4c, c=5 so sum of first 4 terms= 140
3) proof that the curve and line dont intersect- b^2-4ac<0, cant square root a negative value(-7)
4)intergration- c= 8/9
5)diferentiation question when d^2y/dx^2 = 9, value was 44 i think?
6)equation of line gradient was -3/2??, lenght was root 13 t=7/4, and i got something dumb for the area
7) arithmentic series q- 400,8000, d=12, 17th year for jack- 208
8) graph intersection question where gradient is eqaul/ parallel idk point b- (3,9), point c- (-3,1)
9) graph q pretty straight forward, had to remeber to add in y and x intercepts
k=-4, a was 1

Cant remember one of the qs lol
Made this its own thread so people can view it easier 0
reply
6 days ago
#3
(Original post by sdx47x)
C1 EDEXCEL 2019 UNOFFICIAL MARKSCHEME

1a) 63
1b) 5+2root 6
2) 32-4c, c=5 so sum of first 4 terms= 140
3) proof that the curve and line dont intersect- b^2-4ac<0, cant square root a negative value(-7)
4)intergration- c= 8/9
5)diferentiation question when d^2y/dx^2 = 9, value was 44 i think?
6)equation of line gradient was -3/2??, lenght was root 13 t=7/4, and i got something dumb for the area
7) arithmentic series q- 400,8000, d=12, 17th year for jack- 208
8) graph intersection question where gradient is eqaul/ parallel idk point b- (3,9), point c- (-3,1)
9) graph q pretty straight forward, had to remeber to add in y and x intercepts
k=-4, a was 1

Cant remember one of the qs lol

Q2 or 3 - inequalities question the one with -1/2 in it
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6 days ago
#4
Differentiation question being 44? I don't even remember what I put but I don't think I got that 0
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6 days ago
#5
Yeah I don't remember 44 either...
(Original post by dumbasslmao)
Differentiation question being 44? I don't even remember what I put but I don't think I got that 0
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6 days ago
#6
(Original post by Mackenziekav)
Yeah I don't remember 44 either...
I think it was the d^2y/dx^2 the last part it was like -1 +45 = 44
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6 days ago
#7
Oh yeah I did get that nvm 😂😂
(Original post by H.Ash999)
I think it was the d^2y/dx^2 the last part it was like -1 +45 = 44
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Thread starter 6 days ago
#8
(Original post by H.Ash999)
Q2 or 3 - inequalities question the one with -1/2 in it
omg yes thats the one i forgot! i think it was like as the final eqaulity -1/2<x<1/3 ?
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6 days ago
#9
Are we 100% sure t=7/4 because I got that but for AC to equal BC i thought it had to be between 3 and 5
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6 days ago
#10
are you sure about q8? Because I got x = +-9 and a fraction for y? And it all worked out? and how did you work out t? For some reason I got 4/7 but it took me ages getting there lol

(Original post by sdx47x)
C1 EDEXCEL 2019 UNOFFICIAL MARKSCHEME

1a) 63
1b) 5+2root 6
2) 32-4c, c=5 so sum of first 4 terms= 140
3) proof that the curve and line dont intersect- b^2-4ac<0, cant square root a negative value(-7)
4)intergration- c= 8/9
5)diferentiation question when d^2y/dx^2 = 9, value was 44 i think?
6)equation of line gradient was -3/2??, lenght was root 13 t=7/4, and i got something dumb for the area
7) arithmentic series q- 400,8000, d=12, 17th year for jack- 208
8) graph intersection question where gradient is eqaul/ parallel idk point b- (3,9), point c- (-3,1)
9) graph q pretty straight forward, had to remeber to add in y and x intercepts
k=-4, a was 1

Cant remember one of the qs lol
1
reply
6 days ago
#11
Does anyone remember how many marks question 3 was? Instead of using b^2-4ac I equated the equations
Last edited by Dez; 5 days ago
0
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6 days ago
#12
(Original post by ColtonH5364)
are you sure about q8? Because I got x = +-9 and a fraction for y? And it all worked out? and how did you work out t? For some reason I got 4/7 but it took me ages getting there lol
With q8, I believe dy/dx was -12x^-2. The grad on the line was 3/4, but you have to find it’s normal, which is -4/3. Equating that to the gradient function gave you +\- 3 for x.
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5 days ago
#13
ColtonH5364

So A was (5,8) and B was (3,11) and AC=BC and the point C is (t,8) so:
5-t = (square root) (11-8)(squared) + (3-t)(squared)
5-t = (square root) (9)+(9-6t+t(squared))
5-t = (square root) (18 - 6t + t(squared))
(5-t)(squared) = (18 -6t + t(squared))
(25- 10t +t(squared)) = (18 -6t + t(squared))
Therefore 25-18 = -6t + 10t
So 7 = 4t
t= 7/4
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5 days ago
#14
(Original post by Maarlo)
Does anyone remember how many marks question 3 was? Instead of using b^2-4ac I equated the equations
Question 3 was worth 4 marks
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5 days ago
#15
(Original post by sdx47x)
C1 EDEXCEL 2019 UNOFFICIAL MARKSCHEME

1a) 63
1b) 5+2root 6
2) 32-4c, c=5 so sum of first 4 terms= 140
3) proof that the curve and line dont intersect- b^2-4ac<0, cant square root a negative value(-7)
4)intergration- c= 8/9
5)diferentiation question when d^2y/dx^2 = 9, value was 44 i think?
6)equation of line gradient was -3/2??, lenght was root 13 t=7/4, and i got something dumb for the area
7) arithmentic series q- 400,8000, d=12, 17th year for jack- 208
8) graph intersection question where gradient is eqaul/ parallel idk point b- (3,9), point c- (-3,1)
9) graph q pretty straight forward, had to remeber to add in y and x intercepts
k=-4, a was 1

Cant remember one of the qs lol
If you want to add the mark distribution to this:
• Q1 - 1, 4
• Q2 - 3, 2, 1
• Q3 - 4
• Q4 - 1, 6
• Q5 - 2, 4, 1
• Q6 - 8
• Q7 - 4, 2, 3, 2
• Q8 - 2, 2, 5
• Q9 - 5, 5
• Q10 - 6, 2
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4 days ago
#16
wait wasn't 1b) 5-2root6? any idea on the boundaries?
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4 days ago
#17
erm 68 for an A i would say very easy paper in my humble opinion, which is very upsetting considering last year and all
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4 days ago
#18
was 1b) 5-2root6 or 5+2root6?
0
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4 days ago
#19
(Original post by sdx47x)
C1 EDEXCEL 2019 UNOFFICIAL MARKSCHEME

1a) 63
1b) 5+2root 6
2) 32-4c, c=5 so sum of first 4 terms= 140
3) proof that the curve and line dont intersect- b^2-4ac<0, cant square root a negative value(-7)
4)intergration- c= 8/9
5)diferentiation question when d^2y/dx^2 = 9, value was 44 i think?
6)equation of line gradient was -3/2??, lenght was root 13 t=7/4, and i got something dumb for the area
7) arithmentic series q- 400,8000, d=12, 17th year for jack- 208
8) graph intersection question where gradient is eqaul/ parallel idk point b- (3,9), point c- (-3,1)
9) graph q pretty straight forward, had to remeber to add in y and x intercepts
k=-4, a was 1

Cant remember one of the qs lol
u sure 1b) wasn't 5-2root6?
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