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# AQA C1 Unofficial Markscheme

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1. area under graph 45/4
2. (Original post by rndmtngr99)
I worked until the last minute too. I thought the numbers used very challenging and a lot of multiplying decimals was annoying.

For the integration question I got something like 70/12 or something over 12? Anyone get the same?
If I remember correctly I'm pretty sure I got like 243 over 12
3. (Original post by Sayless)
I got 81/4 for the first part, then 45/4 for the second part, I think, something like that, area of triangle is 9.
Area of triangle is 9? 12 I think... (0.5*48)/2
4. (Original post by defibrillator)
The coordinates of the first question was -3,4 or 4,-3 when you had to use simultaneous equations to get the X y values. The equations were something like 5x -2y=-4 and 3x-3y=... or something like that I can't remember tho and did anyone else get k=30 on the first question too..?
I got k = -30
negative
5. (Original post by rndmtngr99)
Area of triangle is 9? 12 I think... (0.5*48)/2
Q x coordinate is -5/4
the x co ordinate of the tip of the triangle is -2,
difference is 3/4 so width = 3/4
triangle heigh is 24
(3/4 x 24)/2
= 18/2
=9
6. (Original post by moe889)
i did too but some guy called tajtsracc keeps saying its root 65
I got root 65 as well..
7. (Original post by rndmtngr99)
And I got root 55 for the circle question?!?
I got root 65 as it was the root of 7^2 + 4 ^ which = 16+49 = 65
Sorry 😬😬
8. (Original post by rndmtngr99)
I worked until the last minute too. I thought the numbers used very challenging and a lot of multiplying decimals was annoying.

For the integration question I got something like 70/12 or something over 12? Anyone get the same?
I got for part B between the intergral of 1 and -2 like 243/12
9. (Original post by TheGreatPumpkin)
I got sqrt(55), but I added up the numbers incorrectly it should have been sqrt(65).
Thanks, I'm almost certain that's what I put! Sorry to hear about the flub. I've also just realised I didn't write translation next to my column vector, and I think I lose a mark for that, so hooray.

-1 plusminus sqrt(5) for the roots of that quadratic, anyone...?
10. (Original post by rndmtngr99)
I worked until the last minute too. I thought the numbers used very challenging and a lot of multiplying decimals was annoying.

For the integration question I got something like 70/12 or something over 12? Anyone get the same?
I got 60/12 which simplifies to 5, then 63 for the area of the trapezium, making the shaded area 58
11. (Original post by Sayless)
Q x coordinate is -5/4
the x co ordinate of the tip of the triangle is -2,
difference is 3/4 so width = 3/4
triangle heigh is 24
(3/4 x 24)/2
= 18/2
=9
Snap. I don't remember what the final area was, though...

I lie, it was 45/4, obtained by 81/4 - 36/4 (integral - triangle).
12. (Original post by Cassette)
Thanks, I'm almost certain that's what I put! Sorry to hear about the flub. I've also just realised I didn't write translation next to my column vector, and I think I lose a mark for that, so hooray.

-1 plusminus sqrt(5) for the roots of that quadratic, anyone...?
That's what I got for the roots I think, what was your column vector?
13. (Original post by Sayless)
I got k = -30
negative
Same I got -30 aswell
14. (Original post by rndmtngr99)
That's what I got for the roots I think, what was your column vector?
0.5
41/4

something like that,
15. (Original post by AccountingHelp)
If I remember correctly I'm pretty sure I got like 243 over 12
yhi put that too!! its right just not simplified.... it goes to 81/4 so probz get 4 marks out of 5
16. think i got like 68/75... kinda annoyed since I was retaking it and was hoping for high 90 ums, not sure what 68 will be
17. (Original post by rndmtngr99)
That's what I got for the roots I think, what was your column vector?
Really sorry, I don't remember...will edit if I do though, it's currently all coming back like a horrible dream!
I got root 65 as it was the root of 7^2 + 4 ^ which = 16+49 = 65
Sorry 😬😬
no k=65 not root 65... root 65 is the radius and it didnt ask for that
19. Core 1 was much easier than previous papers
20. Here are my answers to the questions I can remember:

Surd question: 75-32 square root 5
Circle question: equation tangent I got 7x-4y+8=0
Equation circle (x-5)^2 + (y+3)^2 = 65 (I think I forgot to add on the additional numbers from completing the square and so got this wrong, please let me know)
Coordinates B I got (12, -7)
Length CT I got 9.
Integration question: equation of tangent I got y=-32x-40
x coordinate of Q I got -5/4
Area under curve
I think I correctly got the area under the curve which was 20.25 but after that I just messed up, how many marks do you think I lost for the question? I didn't recognize the whole area of triangle and minus that from area under curve thing.
Completing the square I got (x-7/2)^2 - 41/4
There was a transformation question too and I got a translation of 0.5 and -41/4, but looking back I'm not sure if I got the signs right, I think the y value was supposed to be positive in the translation? I'm sure I got that wrong.
Something about values for k I got k=4 and k=20.
Then something else about values for k I think it was (or was it x?) And I got k>6 and k<-3/2.
Another one about finding roots of an equation and I got x= -1+/- square root of 5.
Remainder theorem I got 20.
The linear factors I got (x+3)(x-4)^2 (can't remember if the first factor was plus or minus actually, just used the one they gave)
That's all I can remember at the moment, if anyone else can shed some light on the ones I'm not sure about and tell me roughly how many marks they think I lost?

Also, what do you suppose the grade boundaries are this year?

Edit: I actually just realised that I'm pretty sure my equation for the circle is right, as the equation is (x-a)^2 + (y-b)^2=r^2 and i worked out the radius using coordinates for centre and point A then just plugged it into equation.

Also, there was another question that asked for the value of k at a specific point like (3+5k, 4-3k) to the best of my memory, and I got k=-30.

Anyone else?

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