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# 2016 May 25th Edexcel Core 2 Questions and answers. [Unofficial mark scheme] 2016 Watch

1. (Original post by medapplicant2016)
That's what I thought, I did get 16.something though, and did work out f"(x) > 0, which usually gives you 2 marks (you don't need to sub)
If you got 16.6 then i think you may only lose 1 mark then just for not subbing for the minimum value
2. (Original post by dididid)
the answer was b= (3a+5)/9
I did this

log 3 (3b+1/a-2) = -1
3^-1 = 3b+1/a-2
1/3= 3b+1/a-2
a-2=9b+3
a-5=9b
b=a-5/9
3. (Original post by tory88)
Is question 6 written out correctly? I get or

EDIT: Seen that there have been amendments since then. Shouldn't 8i) be ?

I think you're correct, this was my workings.

4. (Original post by bulletman54)
If you got 16.6 then i think you may only lose 1 mark then just for not subbing for the minimum value
Cool, thanks so much!
5. (Original post by UKoE Luna)
I think you're correct, this was my workings.

At this point I give up, Yes you are right however the question in the exam may have been . It has been too long, I forget. I'll wait till I can see the paper again tomorow
6. (Original post by X_IDE_sidf)
we are on to V4 now http://docdro.id/18BTG2C

Thanks
Shouldn't question 9c) be to prove that

I forget how to LATEX... Shouldn't the fraction outside the brackets be
7. (Original post by X_IDE_sidf)
At this point I give up, Yes you are right however the question in the exam may have been . It has been too long, I forget. I'll wait till I can see the paper again tomorow
Fair enough, probably the best shout, you can only get so far with memory, but I must thank you for the awesome mark scheme!
8. (Original post by X_IDE_sidf)
At this point I give up, Yes you are right however the question in the exam may have been . It has been too long, I forget. I'll wait till I can see the paper again tomorow
Please quote me in if you give any corrections to the questions.
9. how many marks would b 90 UMS
10. for question 6 b, are we supposed tto give answrs to 1 decimal place?
11. (Original post by tory88)
Shouldn't question 9c) be to prove that

I forget how to LATEX... Shouldn't the fraction outside the brackets be
yes, you're right
12. (Original post by dadawdawd)
for question 6 b, are we supposed tto give answrs to 1 decimal place?
Pretty sure it said to give answers to 1dp yes.
13. (Original post by X_IDE_sidf)
The question didn't have limits at that point, part (a) was simply
Well then it's just +c
14. Can somebody type out the actual question 7b? I cant remember what it was and may help me to remember if i got 24.3
15. (Original post by X_IDE_sidf)

(3 d.p.)
Hey guys I did exactly this in my exam, I remember writing it identically however I got the wrong answer (calculator error maybe?) Would I get the method marks but not the answer mark?
16. (Original post by Dieselblue)
Hey guys I did exactly this in my exam, I remember writing it identically however I got the wrong answer (calculator error maybe?) Would I get the method marks but not the answer mark?
I did u10 - u9 or is that wrong? You should get the method mark if it was only a calculating error.
17. (Original post by Brydon hurst)
I did u10 - u9 or is that wrong? You should get the method mark if it was only a calculating error.
I did ar^(9-1)-ar^(10-1) I got -0.025 though
18. (Original post by Dieselblue)
I did ar^(9-1)-ar^(10-1) I got -0.025 though
Yeah you will definitely get method marks.
19. (Original post by Brydon hurst)
Yeah you will definitely get method marks.
Ok thanks thats good to know
20. any ideas for grade boundaries? roughly how many marks for an a?

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