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# C2 unofficial answers

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1. For d) and e) on question 9, I differentiated wrongly, so in turn got the wrong value for x. However, I did do other correct things in the method like set it equal to 0, then solve for x, then sub x, back into P to find a perimeter.
Any idea how many marks I would get for that mistake?
And then the last one, part e), I differentiated my first derivative correctly this time, and subbed x in and got the right conclusion - I assume I would still get 2 marks here?
2. How
(Original post by AstarAstarA)
Sorry. I hope you did fine on the rest of the questions though.
How many marks would I lose if I didn't put it in radians form. But I got everything else right?
3. (Original post by TeeEm)
Was there an optimization question?
Yes. Last question
4. (Original post by NotNotBatman)
I haven't got a mark scheme.
where did you get that logs answer from then ?
5. (Original post by N^3)
where did you get that logs answer from then ?
Remembering the question.
6. (Original post by AstarAstarA)
Yes. Last question
tough I hope
7. How many marks in the last logs question?
8. (Original post by TeeEm)
Was there an optimization question?
Is that rates of change? If so, yes. It was very similar to the question in June 14 R. it was a quadrilateral triangle connected to a sector and a rectangle.
9. A 64 b 57 c 50 d 44 e 38

10. (Original post by FakeDumbledore)
Unlucky mate I've seen the official mark scheme and a few of these are wrong :/
Better luck next year in your resit...
Looool😂, where's the unofficial Ms bro?
11. (Original post by NotNotBatman)
Is that rates of change? If so, yes. It was very similar to the question in June 14 R. it was a quadrilateral triangle connected to a sector and a rectangle.
Optimisation is finding the minimum value for a shape to work. It is optimising the shape's size
12. (Original post by AstarAstarA)
Optimisation is finding the minimum value for a shape to work. It is optimising the shape's size
Would I loose any marks for not putting it in radians..??
13. (Original post by TheRandomGenius)
S= 24.3??
I think that was for the intergration questions where you had to find the other x-coordinate and then find the area
14. (Original post by NotNotBatman)
Is that rates of change? If so, yes. It was very similar to the question in June 14 R. it was a quadrilateral triangle connected to a sector and a rectangle.
yes, applied differentiation, usually with shapes
15. (Original post by AstarAstarA)
Geometric:
b) 256
c) 1.602

Binomial:
A = 16
k = 7/2
B = 936

Integration:
S = 24.3

Trapezium:
a) 7
b) 20.75
c) R = 5.75

Factor theorem:
a) 5
c) (x + 2)(3x + 2)(2x - 1)

Differentiation(Q10):
a) 1/3PIx^2
d) Minimum = 120m
c) x = 16.63... => f''(x) = 0.437 > 0

Trig identities:
a) Theta = 8/15Pi , -2/15Pi
b) x = 194.5, 345.5

Circle:
a) root(34)
c) 3x + 5x - 95 = 0

Log:
i) (a - 5)/9
ii) -2.19

R u sure log was -2.19 because we divide -2.19 by 3 which will give us -0.73
16. (Original post by AstarAstarA)
It's a troll. Leave them be otherwise they come back for more
fair enough
17. (Original post by Amirshazad)
R u sure log was -2.19 because we divide -2.19 by 3 which will give us -0.73
Yeh it's about right, just put it in on your calc, that's what I did with my answer (-2.08) and it was really close to 0
18. (Original post by oinkk)
For the binomial my friend and I got B = -1008?
You had to do 1944-1008 or -1008+1944 to get B as 936.
19. How many marks was the 2nd logs question?
20. (Original post by Turtlebunny)
For d) and e) on question 9, I differentiated wrongly, so in turn got the wrong value for x. However, I did do other correct things in the method like set it equal to 0, then solve for x, then sub x, back into P to find a perimeter.
Any idea how many marks I would get for that mistake?
And then the last one, part e), I differentiated my first derivative correctly this time, and subbed x in and got the right conclusion - I assume I would still get 2 marks here?
It depends on where they allocate marks, if its A1 (answer) marks it has to be the correct answer so you would drop one mark on showing its a minimum but they coule put ECF. I imagine you will lose 2/3 marks on d) because 2/3 marks will be A1/2/3 marks, perhaps 2 for differentiation correctly and another for the correct final answer. If you are lucky you will drop 3 marks if not it could be 4/5

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