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# Core 1 - AQA May 2015 Unofficial Mark Scheme watch

1. (Original post by 2014_GCSE)
I did the second half of it, and got it correct! You could still do the differential/stationary point stuff because the previous question was a show that so you could still use it.

I only lost 5 marks (and may get like 1 method mark for my various attempts). So 70-71/75, which I think should be a decent UMS, no?
Ah I see, and seems like a lot of people found it hard (that ive talked to) so the 100 UMS mark might be a few lower than 75 so you'll defo be close.
2. (Original post by youarewrong)
i agree with all of it except the cylinder question which you have to have wrong purely because you cannot have a negative radius.
The radius is +4 which gives you a second derivative of -12pi so therefore it is a max value, that was the answer
3. (Original post by JamieOH)
Ah I see, and seems like a lot of people found it hard (that ive talked to) so the 100 UMS mark might be a few lower than 75 so you'll defo be close.
I hope so. It's annoying to me because I genuinely knew Core 1 inside and out. Like the cylinder stuff isn't in the Core 1 specification, it's just a GCSE assumption... hmm
4. (Original post by 2014_GCSE)
I hope so. It's annoying to me because I genuinely knew Core 1 inside and out. Like the cylinder stuff isn't in the Core 1 specification, it's just a GCSE assumption... hmm
Yeah it was kinda harsh. I had no clue what the formulas were but I kinda just figured them out. Best of luck(:
5. (Original post by JamieOH)
Yeah it was kinda harsh. I had no clue what the formulas were but I kinda just figured them out. Best of luck(:
Thanks man. Best of luck to you too.
6. (Original post by rhoxc)
Ahhh i don't even know what to think about it, i feel like i got an A but at the same time i feel like i got an E

Does anyone thing the grade boundaries will be high
I feel exactly the same! I keep thinking about all the bad bits and then i stress that i have failed and then other times i think about the good bits and think it went well! Ugh i really hope the boundaries are low! I think they will be, a lot of people found it hard!
7. (Original post by 2014_GCSE)
I hope so. It's annoying to me because I genuinely knew Core 1 inside and out. Like the cylinder stuff isn't in the Core 1 specification, it's just a GCSE assumption... hmm
They are in the specification under optimisation. There's many questions to do with 3D shaped like that you're meant to know formulas for them apart from for a sphere and a cone which is given in the formula booklet. They're not allowed to out anything that isn't on the specification in the exam. Hope you still got a really good mark though bc you seem to have worked really hard
8. do you know how many marks q8 was out of in total??
9. Anyone know the amount of marks for each question?
10. How many marks was the cylinder question?
11. for the cylinder question was it okay to put your final answer of h in terms of r as (48-r^2)/2r? (under a common denominator of 2r) or did we have to leave it as 24/r - r/2? i wouldn't lose any marks, would i?
12. (Original post by InaneRambler)
I believe there are some errors here.

(4) (c) 8 and -2
(4) (d) Is 3. How can the distance from the centre of a circle to the midpoint of a chord be greater than the radius?
(6) (b) (ii) Wasn't it +12pi? And so it's a minimum not a maximum? (not sure about this)

@ihatehistory The last question was worth 4 marks so I'm guessing probably most of them. Factorisation (1) Diagram (1) Correct inequalities (2) As a guess.
the radius was actually 5 root 2 from what I remember which is greater than 7
13. Hi guys,
For the polynomial/long division question where we asked to use the factor theorem to show (x+2) is a factor of p (x) or did we just have to put it in the form specified and then show that (×+2) is the only factor?
Thanks.
14. (Original post by chancehaycock)

Equation of line: 5x – 3y +1=0
Co-ordinates of A (9,-4)

2. 7 + root15

3. Tangent = y-6=-10(x+1) (no form required)

Area under graph = 108/5 Trapezium = 54 Therefore Area Bound by curve and line =54-108/5 = 162/5 square units

4. (x+1)2 + (y-3)2 = 50

C = (-1,3)
R = root50 = 5root2
K=-2, K=8
Shortest Distance from C to QR = root49 = 7

5. x2 + 3x +2 = (x+3/2)2 -1/4

Vertex = (-3/2,-1/4)
LOS: x=-3/2
Translated Graph = (x-1/2)2 +15/4
This then expands to x2 –x +4

6. 48π=πr2 +2πrh

So h = 48π – πr2 / 2πr

Hence h = 24/r - r/2

V=24πr – πr3 / 2

dV/dr = 24π – 3πr2 / 2

Stationary Point: r=4

D2V / Dr2 = -3πr = -12π = negative = maximum point

7. Remainder = 36
P(x) = (x+2)(x2 -5x+10)
B2-4ac < 0 therefore no real solutions for quadratic.
Only solution is when x = -2

8. 9k2 – 32k – 16 < 0

(9k+4)(k-4) < 0
Critical values = -4/9 and 4
Therefore -4/9 < k < 4

Hi guys,
For the polynomial/long division question where we asked to use the factor theorem to show (x+2) is a factor of p (x) or did we just have to put it in the form specified and then show that (×+2) is the only factor?
Thanks.
15. From what I remember T got 3 bits wrong, the shortest distance in question 4, the drawing of the graph in question 5 and question 6 the cylinder proof question. I don't think i made any other mistakes. Does anybody know how many marks i will have lost because I am hoping I got 65 minimum.
16. Had to use factor theorem If I remember correctly so basically Just showing that P(-2) = 0 and then show that the quadratic had no solutions using the discriminant
17. Hi, on the last bit of the last question, I used the quadratic formula and then didnt go further and just put the critical values in quadratic formula form, do i get any marks?
18. Hi can someone put how many marks each question was. and the question for each answer?
19. Probably a piss take question but do you happen to remember the marks for the questions ?
20. hi can someone post the marks beside each question

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