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# C1 Maths AS aqa 2016 (unofficial mark scheme new)

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1. to get 100 ums, is 75/75 marks usually required?
2. (Original post by laprug)
Yh thats what i got. Thanks god lol. I think it was q8 as q7 was the intergration section
anyone remember how the question where they asked to show that it was a decreasing function?
3. (Original post by Andrew Dainty)
to get 100 ums, is 75/75 marks usually required?
My estimate is 73 for 100UMS on this paper. Usually its 74, but I feel there were many rooms for mistakes on this paper.
4. for one of my questions, I noticed I made a mistake early on
I factorised out the two when completing the square but forgot to divide the 4, do you think I will get follow through marks ? :// I'm seriously worried I only noticed when I had 50 seconds left.

it was something like -2(x-4)^2

(Original post by Jacobisswaggy)
For the one where you had to prove it was a minimum value, I believe you first need to find that it is a stationary point by subbing in to dy/dx, then subbing in to d^2y/dx^2 to show it is a minimum.

I base this on the fact the question was 4 marks, and it wouldn't be 4 marks for only subbing in to d^2y/dx^2.
this is exactly what I thought but I tried putting the value into dy/dx like twice and I couldn't get zero so I just left it with d2y/dx2 :/

(Original post by chemica)
anyone remember how the question where they asked to show that it was a decreasing function?
I think it was part of the question I just quoted
something like dy/dx = (-2)^5 -9 (-2)^2 not entirely sure
(Original post by Jacobisswaggy)
My estimate is 73 for 100UMS on this paper. Usually its 74, but I feel there were many rooms for mistakes on this paper.
practically everything was fractions!!I had to do all the questions twice...
5. (Original post by Jacobisswaggy)
My estimate is 73 for 100UMS on this paper. Usually its 74, but I feel there were many rooms for mistakes on this paper.
I think i got 71/75 on this paper. oh well :/
6. (Original post by Sniperdon227)
The q 'stated' (x-a)^2 + (y-b)^2 = k
where 'k' = r^2 = 65
anyone who put sqroot65 is wrong and would of lost 1 mark
I've done a few past papers and sometimes they allow a mistake of finding r or r^2, so if your lucky you may get the mark for doing root65
7. (Original post by Cassette)
Wait, are we 100% positive the first question asked for a parallel line? I could have sworn it said perpendicular and gave 5/3 as my gradient...
it said parallel to the curve
8. (Original post by osshhas)
Could you include how many marks each question is work. I think Question 1) 2
2) 5
i will try if i can remember
9. (Original post by beanigger)
it said parallel to the curve
****. I can't remember how much of the rest of question 1 is screwed up by this now. I thought I had around 71/75, so much for that.
10. (Original post by alkaline.)
this is exactly what I thought but I tried putting the value into dy/dx like twice and I couldn't get zero so I just left it :/

I think it was part of the question I just quoted
I subbed point P, x coordinate into dy/dx and got 0 and said that it was a decreasing function. It is the x- coordinate of P right ?
11. (Original post by Cassette)
****. I can't remember how much of the rest of question 1 is screwed up by this now. I thought I had around 71/75, so much for that.
XD same with me lol i went in saying 100 ums here i come went out saying how much do milkmen get paid?
12. (Original post by chemica)
I subbed point P, x coordinate into dy/dx and got 0 and said that it was a decreasing function. It is the x- coordinate of P right ?
yes you use the x coordinate of p
I put dy/dx <0, then put in P and showed it was less than zero and therefore decreasing

on one of the questions P was (-2,24) idk if it's the same one and might trigger someone's memory on the rest of the question
13. (Original post by beanigger)
Unoffical Mark scheme for C1 AQA 2016

It would help if you could link answers to questions as i cant remember them

Questions
1) a)Asked to work out gradient of a tangent, m= - 5/3 [2]
b)Asked to find co-ordinates of B B( - 3,4) [3]
c)Asked to find K K= - 30 [2]

2) a) simplify (3√5)^2 = 45 [2?]
b) i cant remember the question but the answer was75 - 32√5 [5]

3) a) y=(x-7/2)^2 - 41/4
b) min value = -41/4
c) Translation of (1/2 , 41/4)

4) a) show that (x+3) was a factor of x^3 - 5x^2 -8x + 48, p(-3) = 0, (x+3) is a factor of p(x).
b) three linear factors of p(x) = (x+3)(x-4)(x-4)
c) find remainder when p(x) was divided by (x+2) R=20
d) Factorise p(x) using (x+2) R = (x-2)(x^2-3x+14) + 20 [3]

5) a) asked to find equation of circle (x-5)^2+(y+3)^2=65 (note 65 = r^2) [3]
b) asked to find co-ordinates of B (AB is diameter) B ( 12, -7) [2]
c) asked to find equation of tangent at A 7x-4y+18=0 [5]
d) asked to find length of CT = 9 [2]

6) a) y=-32x-40
b)Q(-5/4) [1]
c) upside down positive graph passing through y axis at 8 [2]
d) x = -1±√5

7) a) i think there was 4 parts to this question i cant remember part a and b
b)
c) definite integral = 81/4 [5]
d) area of shaded region = 45/4 [3]

8) a) cant remember anything except the answers were k>6 and k<-3/2

Answers that need a question to be assigned to
- k=4 and k=20
- d^2y/dx^2= - 2x - 9x^2 sub in x-coord of p to get 45, 45>0 therefore minimum
5c is wrong there was a integer of 1
14. Hi, if I got 20 1/3 for question 7c will I get full marks for getting 11 1/3 for part d do you think?
15. (Original post by alkaline.)
yes you use the x coordinate of p
I put dy/dx <0, then put in P and showed it was less than zero and therefore decreasing

on one of the questions P was (-2,24) idk if it's the same one and might trigger someone's memory on the rest of the question
thank you
16. (Original post by Cassette)
Wait, are we 100% positive the first question asked for a parallel line? I could have sworn it said perpendicular and gave 5/3 as my gradient...
For parallel it gives you the answer -5/3 if you rearrange the equation and divide by 3.
17. (Original post by Rit101)
Nope pretty sure the top students in my Sixth Form got root65 as the radius
Its root 64
18. What was the question for k=4 and k=20?
19. (Original post by bendrake123)
Its root 64
it is root 65

been discussed many times and proven
20. For all those getting 34 as the radius squared, I'm sorry but you're wrong.

To find the radius you find the length between centre C and point A.

C (5,-3). A (-2,1) root(7^2+4^2) = root(49+16)

=root(65)

Then square root(65) for k in the question.

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