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# AQA maths core 1, 13th May 2015 watch

1. (Original post by C0balt)
Completing square with fraction/decimal has come up before, but the transformation was much more complex than usual ones. Cylinder one was trickier than usual differentiation questions. But I wouldn't worry about your grade as it will be reflected in the grade boundaries.
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Yes the transformation part was the tricky part. I changed the bracket to (x - 0.5)^2 then added +4 to the end but I don't know whether that's right. I'm just hoping that the grade boundaries are lower than usual. Originally I was hoping for full UMS but I don't think I've got a chance now as I probabbly got around 62/75
2. (Original post by OneHotTurtle)
For the transformation question, I ended up with an equation that went something like y = x^2 - 1/2x + 61/16, did anyone get anything similar, just want to know
It was something like x^2-x+4

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3. (Original post by Kiloby)
I wrote down all the answers except for the "show that" ones on my Candinate Number slip
Had very little room, so can't say which answer is which sub-question, only the numbered question.

Equation of perpendicular line: 5x-3y+1=0
Coordinate of A =(9,-4)

3. Tangent at A : y= -10x-4
Area under graph : 108/5

4. Equation of circle : (x+1)^2 + (y-3)^2 =50
Centre = (-1,3)
K = (-2,8)
Shortest distance (C to QR) = 7

5. After completing the square : (x+3/2)^2 -1/4
Vertex = (-3/2, -1/4)
Line of symmetry: x=-3/2
Translated graph : y=x^2 -x+4

6. h= 24/r - r/2
dV/dt = 24pi -3pir^2/2
r=4 d*2V/dt^2 = -12pi
So a maximum value.

7. r=36
Factorised : (x+2)(x^2-5x+10)
Only root: x=-2

8. -9/4<k<4
8 was -4/9<k<4 as the bracket was (9k+4)
4. (Original post by Rob194656)
3 small errors on cylinder question; Firstly I left the first part in the form (48-r^2)/2r, then I did not state r=+-4 (only positive 4, as that's what the question asked you to find) and finally I left the second derivative as -3(pi)*4 and then stated it was therefore a maximum. Would these lose marks?
I doubt you'd lose a mark for not saying r=+-4. As long as you stated the positive value it should be ok as the question said 'find the positive value of r'. However you'd probably lose a mark as you didn't say why it's a maximum. You have to say d2y/dx^2 < 0
5. (Original post by SunDun111)
yeah but what about with like arithmetic sequences, they is so many different type of questions they can ask you it seems so hard.
The formulas are in the booklet given to you
6. I recall getting an answe like x^2-x+6 or something.
7. Hi people..im an A2 student. Managed to get a hand on the paper and finished it in class. If you want me to send you the answers with working out just PM and ill send them
8. could you send them to me please
9. For the cylinder question I annoyingly left the answer as h=(48pi-pir^2)/2pir. I now realise it can be further simplified...How many marks do you think i will lose for this??
10. (Original post by jakecre8)
could you send them to me please
PM me your email..I'll send you the pictures
there's a few I can't attach it to this
11. I dont know how many marks it was worth. but it asked to show that V equalled a certain form. thus, by not simplifyijg completely, you may not get the answer mark. although, in core one, there is a lot of condoning in the marks schemes.
12. (Original post by omarkhatri)
Hi people..im an A2 student. Managed to get a hand on the paper and finished it in class. If you want me to send you the answers with working out just PM and ill send them
Could you send them to me please? Thanks
13. (Original post by bunulot)
For the cylinder question I annoyingly left the answer as h=(48pi-pir^2)/2pir. I now realise it can be further simplified...How many marks do you think i will lose for this??
I left my answer unsimplified, exactly like you. However in the question it didn't say to simplify it, it only said to "find an expression for h in terms of r" so in my opinion I think you should get full marks. Let's hope it says OE in the mark scheme

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14. Can you send to me please. And can you possibly include the marks for the questions and what the marks are for within the answers so ie) the ethos marks and answer marks (sorry it's a lot to ask)
15. I'm nervous although I got the area under curve and integral question write I wrote it as 648/30 which is equivalent to 108/5. But this could not get full marks apparently..could the boundaries increase? I reckon I got 50-52 but if the boundaries increase I might not get a C..
16. Predictions for c2?
17. (Original post by laur a)
Predictions for c2?
as hard as 2014
18. (Original post by gottapassitall)
it was open top so the surface are was just pi r^2 + 2rh pi = 48 then you rearrange to get h=(48- pir^2) / 2r
then you workout the volume equation which was v=pihr^2 then sub what you got for h into the equation and simplify
It was open top?! Why do I have an inability to read questions thoroughly? Not looking forward to core 2 lol
19. my teacher says "RTFQ" (read the effing question).
20. (Original post by jakecre8)
my teacher says "RTFQ" (read the effing question).
LOL
I might start using that lol I tend to mumble "c0balt you idot read the f... Ahem question" in lessons
With RTFQ no need to worry about slipping f word out of my mouth haha

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