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# EDEXCEL CORE 1 MAY 18TH - Unofficial Markscheme

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1. (Original post by TrueDAN)
Damn you have a good memory. That's sick!
For 9C i got £1050 but I may have messed up on it.
For 11 C and D I got the Y to equal 1/2 and D I got 17x-2y + 35 =0 so again I may have messed up.
For 10c : I am pretty sure that it is 162/3 units^2 and not 76 via splitting it into a trapezium and triangle.
I agree with the simultaneous equations - I definitely got answers like that.
Thanks for remembering Q11 A I agree with that and they for the rest I got the same!
How many marks was q6)c and q9 a,b,c,d?
I got 17x-2y+35 too
and 162/3
2. what was question 9b asking?
3. (Original post by SM45367)
EDEXCEL C1:
Q1) 2/5X^3-8X^1/2+3X+C
Q2) y=6X+2
Q3)a) 2root 2
b) 3root 6
Q4a) stretch in y-direction by scale factor 3.
b) translate by vector (0,-4) (downwards)
Q5) X=-1/7 ; Y= -1/3 X=-3/7 ; Y=1/3
Q6)a) A2= 5-4K A3= 5-5K+4K^2
B) 4K^2-9k+1
C)I) I forgot to do again lol
Q7)dy/dx= 6X+2X^-2/3+X^1/2+7/6(X^3/2)
Q8)a) proof of inequality- had to substitute the 2 equations and the discriminant<0
b) 1/2<P<9/2
Q9)a) £225
b) £180
c) £1710
d) 18 years from 10 years old so 27 years old
Q10)a) 5Y+3X-44=0 b) R: (44/3,0) c) area of Quad: 76 units (this proved extremely difficult when splitting into 2 triangles, so I split in 2 triangles and a rectangle)
Q11)a) dy/dx= 6X^2+2KX+5
b) K=41/8=5.125
c) y co-ordinate- 49/2
D) 2y-17x-83=0

give the correct answer if any of these are wrong and ill edit it
For Question 10) c, I got 163/3 or something, but I'm not sure about that. I found where L2 crossed the y-axis, called that S, then found area of triangle PQS, which I subtracted from the bigger triangle OSR. Sorry, I can't explain very well without diagrams or anything. But 163/3 is a weird answer, so I'm probably wrong... :/
4. (Original post by TrueDAN)
That was a tough paper no question. here are some of the answers I got, that my memory can recall. Feel free to share any you remember before the unofficial one is released I feel like I have done worse than expected

Q1. Typical integration question - should be fine as long as you remember the +C
Q2. 3^6x + 2 : I nearly messed up on that one yikes!!
Q3. 5root2 - 3root2 leaving 2root2
I then got 3root6 - you ended up with 24root6 over 8
Q4.
Q5. Not a fan of this one at all. 5-K and a quadratic - my memory is slacking!!
The one marker was 500 - you got 5 each time - I guessed this one and got it wrong.
The hell of a quadrilateral I got 326/6 which you could simplify to 163/3 units^2. I split it into a triangle and trapezium. The fact that R was 44/3,0 is just cruel.
You got this from the equation 3x - 4y -44 = 0 or again something similar to that. Y = 0 at point R so 3x=44 therefore X = 44/3
The value of K was also awful - I got 41/8 via equating the gradient function to the gradient of the line being 17/2. Again, nasty nasty numbers.
Y= 1/2 when X = -2
17x -2y + 35 = 0 is what I got for tangent equation.

There was quite a challenging discriminate one. You had to make then 2 equations equal one another, and you get values of:
A= 2P, B = -6p-3 and C = 3p-7 or something similar.
When solving it, I got P > 1/2 and P< 9/2

I got John to be 27 as (n-18)(n+25)
Total money on his birthday something like £1050?

The differentiation one was alright for the most part but I've probably messed up on it. The powers were harsh - can't remember it perfectly.

Feel free to correct me if I'm wrong and share answers if you want. It's just a rough guide of stuff, hopefully the official one will be out soon to stop us all worrying!
Bro, this has literally made my ****ing day. Apart from the area question with that ****ing quadrilateral, I got most of what you got. (SIGH OF RELIEF) I might just be able to put Oxford on the offers list. Thanks so much.
5. Does anyone remember the number of marks available for each question
6. What was question 9b and c asking. The sum when he's 18 and 21?? and how many marks was it again
7. (Original post by SM45367)
EDEXCEL C1:
Q1) 2/5X^3-8X^1/2+3X+C
Q2) y=6X+2
Q3)a) 2root 2
b) 3root 6
Q4a) stretch in y-direction by scale factor 3.
b) translate by vector (0,-4) (downwards)
Q5) X=-1/7 ; Y= -1/3 X=-3/7 ; Y=1/3
Q6)a) A2= 5-4K A3= 5-5K+4K^2
B) 4K^2-9k+1
C)I) I forgot to do again lol
Q7)dy/dx= 6X+2X^-2/3+X^1/2+7/6(X^3/2)
Q8)a) proof of inequality- had to substitute the 2 equations and the discriminant<0
b) 1/2<P<9/2
Q9)a) £225
b) £180
c) £1710
d) 18 years from 10 years old so 27 years old
Q10)a) 5Y+3X-44=0 b) R: (44/3,0) c) area of Quad: 76 units (this proved extremely difficult when splitting into 2 triangles, so I split in 2 triangles and a rectangle)
Q11)a) dy/dx= 6X^2+2KX+5
b) K=41/8=5.125
c) y co-ordinate- 49/2
D) 2y-17x-83=0

give the correct answer if any of these are wrong and ill edit it
Can you remember the question for 10. I can't remember the equation of the line that L2 was parallel to.
8. (Original post by SM45367)
EDEXCEL C1:
Q1) 2/5X^3-8X^1/2+3X+C
Q2) y=6X+2
Q3)a) 2root 2
b) 3root 6
Q4a) stretch in y-direction by scale factor 3.
b) translate by vector (0,-4) (downwards)
Q5) X=-1/7 ; Y= -1/3 X=-3/7 ; Y=1/3
Q6)a) A2= 5-4K A3= 5-5K+4K^2
B) 4K^2-9k+1
C)I) I forgot to do again lol
Q7)dy/dx= 6X+2X^-2/3+X^1/2+7/6(X^3/2)
Q8)a) proof of inequality- had to substitute the 2 equations and the discriminant<0
b) 1/2<P<9/2
Q9)a) £225
b) £180
c) £1710
d) 18 years from 10 years old so 27 years old
Q10)a) 5Y+3X-44=0 b) R: (44/3,0) c) area of Quad: 76 units (this proved extremely difficult when splitting into 2 triangles, so I split in 2 triangles and a rectangle)
Q11)a) dy/dx= 6X^2+2KX+5
b) K=41/8=5.125
c) y co-ordinate- 49/2
D) 2y-17x-83=0

give the correct answer if any of these are wrong and ill edit it
for question 10 everyone including me from my school got 163/3 which is 54.33333.
9. (Original post by Hasan98)
Oops nevermind
I think i got that too
Dare we start guessing at UMS/grade boundaries??
Since 2013, grade boundaries have been fluctuating between 63/64 for an A. The papers were relatively easy comparing to today's though I think so hopefully ours will be lower?
11. (Original post by bobmarly024)
for question 10 everyone including me from my school got 163/3 which is 54.33333.
For 6b i got 4k^2-9k+14
12. 1. Simple Intergration remembering C
2. 6y-3 ?
3. 2 rout 2, 3 route6
4. Graphs simple
5. Something like 1/3 and 1/7 with minuses cant remember
6. 500 and a proving a2 and a3
7.Long differentiation all i remember is 7/3x^3/2
8. 1/2< P <9/2
9.225 age 27
10. i got area as 35 unit ^2 by spltitting into a rectangle and two triangles but i assume thatd be wrong as people have got something over 3 before.
11. 17x -2y + 35 = 0 41/8 and 17/2 grad

Think area and maybe a part of last Q wrong how much was area worth if anyone can remember, hopefully i get maybe 68/69
13. (Original post by SM45367)
EDEXCEL C1:
Q1) 2/5X^3-8X^1/2+3X+C
Q2) y=6X+2
Q3)a) 2root 2
b) 3root 6
Q4a) stretch in y-direction by scale factor 3.
b) translate by vector (0,-4) (downwards)
Q5) X=-1/7 ; Y= -1/3 X=-3/7 ; Y=1/3
Q6)a) A2= 5-4K A3= 5-5K+4K^2
B) 4K^2-9k+1
C)I) I forgot to do again lol
Q7)dy/dx= 6X+2X^-2/3+X^1/2+7/6(X^3/2)
Q8)a) proof of inequality- had to substitute the 2 equations and the discriminant<0
b) 1/2<P<9/2
Q9)a) £225
b) £180
c) £1710
d) 18 years from 10 years old so 27 years old
Q10)a) 5Y+3X-44=0 b) R: (44/3,0) c) area of Quad: 76 units (this proved extremely difficult when splitting into 2 triangles, so I split in 2 triangles and a rectangle)
Q11)a) dy/dx= 6X^2+2KX+5
b) K=41/8=5.125
c) y co-ordinate- 49/2
D) 2y-17x-83=0

give the correct answer if any of these are wrong and ill edit it
There are a few here which I'm not sure of.

Q11(c): I think you've done something wrong, because I got 1/2.
(d): By extension, I think that this is wrong too. I got 2y - 17x + 35.
14. This was a murder. I hope the grade boundaries will be lowered.... (so much harder than previous years)
15. 1. Simple Intergration remembering C
2. 6y-3 ?
3. 2 rout 2, 3 route6
4. Graphs simple
5. Something like 1/3 and 1/7 with minuses cant remember
6. 500 and a proving a2 and a3
7.Long differentiation all i remember is 7/3x^3/2
8. 1/2< P <9/2
9.225 age 27
10. i got area as 35 unit ^2 by spltitting into a rectangle and two triangles but i assume thatd be wrong as people have got something over 3 before.
11. 17x -2y + 35 = 0 41/8 and 17/2 grad

Think area and maybe a part of last Q wrong how much was area worth if anyone can remember, hopefully i get maybe 68/69
16. (Original post by chloe_white03)
Since 2013, grade boundaries have been fluctuating between 63/64 for an A. The papers were relatively easy comparing to today's though I think so hopefully ours will be lower?
I always thought that they did 80% for an A. Is that not true?
17. What were the answers to 6?

Was it 5-4k for a1, as well as 5-5k+4k^2 for a3.

Then was part b the one where you had to find the sum of the first three terms?

I got 4k^2-9k+17

Then the last one was 500?

I have a feeling I'm missing something here.
18. (Original post by SM45367)
EDEXCEL C1:
Q1) 2/5X^3-8X^1/2+3X+C
Q2) y=6X+2
Q3)a) 2root 2
b) 3root 6
Q4a) stretch in y-direction by scale factor 3.
b) translate by vector (0,-4) (downwards)
Q5) X=-1/7 ; Y= -1/3 X=-3/7 ; Y=1/3
Q6)a) A2= 5-4K A3= 5-5K+4K^2
B) 4K^2-9k+1
C)I) I forgot to do again lol
Q7)dy/dx= 6X+2X^-2/3+X^1/2+7/6(X^3/2)
Q8)a) proof of inequality- had to substitute the 2 equations and the discriminant<0
b) 1/2<P<9/2
Q9)a) £225
b) £180
c) £1710
d) 18 years from 10 years old so 27 years old
Q10)a) 5Y+3X-44=0 b) R: (44/3,0) c) area of Quad: 76 units (this proved extremely difficult when splitting into 2 triangles, so I split in 2 triangles and a rectangle)
Q11)a) dy/dx= 6X^2+2KX+5
b) K=41/8=5.125
c) y co-ordinate- 49/2
D) 2y-17x-83=0

give the correct answer if any of these are wrong and ill edit it
The area I think was as a decimal 54.3 and the last answer the was 2y -17x -(53 or 54 can't remember)
19. I think 8b was meant to be p>1/2, p<9/2, as they asked 'set of values' instead of 'set values'
20. (Original post by Puddles the Monkey)
What exam board is this for?
Wasn't K = 21/2 as u had to sub -2 into the dy/dx and equate it to 17/2

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