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

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

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 :smile:

Reply 2

H.Ash999

7

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

Reply 3

dumbasslmao

8

Differentiation question being 44? I don't even remember what I put but I don't think I got that
:s-smilie:

Reply 4

Mackenziekav

4

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
:s-smilie:

Reply 5

H.Ash999

7

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

Reply 6

Mackenziekav

4

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

Reply 7

sdx47x

OP

4

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 ?

Reply 8

Man of Economy

10

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

Reply 9

ColtonH5364

6

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

Reply 10

Maarlo

1

Does anyone remember how many marks question 3 was? Instead of using b^2-4ac I equated the equations

(edited 4 years ago)

Reply 11

H.Ash999

7

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.

Reply 12

Mackenziekav

4

@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

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

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

Reply 15

TheEinsteined

9

wait wasn't 1b) 5-2root6? any idea on the boundaries?

Reply 16

aladin101

6

erm 68 for an A i would say very easy paper in my humble opinion, which is very upsetting considering last year and all

Reply 17

TheEinsteined

9

was 1b) 5-2root6 or 5+2root6?

Reply 18

TheEinsteined

9

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?