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# OCR C3 (not MEI) Official Thread - Tuesday 21st June 2016

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1. (Original post by treeco)
Can anyone remember the 1st equation you had to integrate in Q2?

Think it was something like (4-1/x)^5

If so, wouldn't the answer be x^2/6(4-1/x)^6...with no ln ?
I got that!
2. (Original post by mil88)
I got all but 81.92 part.

I got 65.5.. and thus 66.
Yup you're right, my bad!
3. (Original post by drandy76)
Plugging pi/6 into a calculator gives 2, not 1, it was 0.6something

Posted from TSR Mobile
Yeah I got 0.6....And 2.6.... But 2.6 was outside the range so the solution was 0.6
4. (Original post by drandy76)
Plugging pi/6 into a calculator gives 2, not 1, it was 0.6something

Posted from TSR Mobile
yeah I got 0.659
5. I'm guessing that no body else got a=1 and b=320
6. For the iterative question did you have to put the answe to 4 decimal places or 3? I did everything to 4???? How many marks have I lost? I also therefore put the intersection point to 4dp?
7. On question 8ii I put that f(x) couldn't have an inverse because of the modulus and that you can't inverse a modulus. I also wrote that the graph would be one to many and that it wouldn't be a function. Was the first part right and if it wasn't would I get the marks for the second part?
8. Can we add a poll to this?? how hard did everyone find it and what grade boundaries do you reckon?
9. how many marks would you lose for not getting A and B i did everything else right i even calculate the y value as 18 just didn't solve the simultaneous equations
10. (Original post by rich1334)
My solutions, in order:Y=12x+15
4x-4lnx-1/x+c
3/16(4x+1)^4/3 + c
128, 81.92
31 hours
1/13, 3/4
Show ln2
5/2
A=6, B=5
Graph
Root 0.242
Graph transformations
Ranges: all real, greater or equal to 4a, modulus has no inverse
Inverse: 1/5(x+4a)
X=1.5a, x=-2.5a
Show equiv to 2
4+2root2
0.659
32sin(x)
No guarantee these are right but I'm pretty confident
These are pretty much exactly the same results i got, except in question 9 i got the value of 0.66, not 0.659, i rounded to 2sf where i should have rounded to 3, probably won't get that mark.
I'm feeling confident about my answers, so it's reassuring to have someone else confident with the same answers :P
11. Can anyone remember what f(x) and g(x) were?
12. (Original post by Yazmin123)
how many marks would you lose for not getting A and B i did everything else right i even calculate the y value as 18 just didn't solve the simultaneous equations
You'll probably lose 1 mark for not solving the equations and 2 marks for each answer i'm guessing
13. What was the 8 mark question 6? The one with a=6 b=5?

I want the exact question with equations if possible?

I don't know why but I remember getting b=5 and a= 3 or 2?
14. (Original post by HecTic_H)
Grade boundaries anyone?
Going to guess:
41 - C
47 - B
53 - A
59 - A*
Really difficult paper imo.
Agree with you)
May be 1 mark higher for each grade)
Paper was not terrible but it was harder than the average paper)
15. (Original post by Mrrexxxx)
For the iterative question did you have to put the answe to 4 decimal places or 3? I did everything to 4???? How many marks have I lost? I also therefore put the intersection point to 4dp?
Only 1 I'd say if your value was the correct answer to 4 SF.
16. (Original post by Dom1997)
Only 1 I'd say if your value was the correct answer to 4 SF.
If I can remember correctly, the question asked the values of Xn to be to at least 4 sig figs. If you did it to 4dp that is fine. If you put your answer to 3 dp which = 4sf you will probably loose one mark.
17. for q8, I got -1.5 and 2.5; not 1.5 and -2.5. how many marks you think have I lost? And what did people get for 8 part i?
18. (Original post by Agent47_)
If I can remember correctly, the question asked the values of Xn to be to at least 4 sig figs. If you did it to 4dp that is fine. If you put your answer to 3 dp which = 4sf you will probably loose one mark.
Thats was for xn I think. The actual root had to be 3 SF
19. unofficial mark scheme??
20. Does anyone remember what g(x) was?

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