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# Mr M's OCR (not OCR MEI) Core 2 Answers May 2016

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1. (Original post by Bobyhowars)
Can you tell me why please
Because if is true then
Hi, for q6 part iii I went wrong in the method somewhere and got the wrong answer, but I realised and still wrote N=38. How many marks would I get? Also for the equating coefficient question I used k as the coefficient and somehow got +/- root 1/9. Would I get any marks?
6iii) should get full marks

your other question just sounds wrong - probably no marks for that bit
3. (Original post by Kantth)
For 9 (ii) dont even know what i did but ended up gettin a=0 and when i subbed a into another equation it gave me k=0 would i even get a mark for writing k=0 or will they ignore it?
No marks.
4. Does anyone happen to have a copy of the question paper please?
5. (Original post by Mr M)
6iii) should get full marks

your other question just sounds wrong - probably no marks for that bit
Thanks - will i not drop marks for getting the method wrong?
Also what was the question for the last part of question 9?
6. (Original post by Mr M)
7) drop 1

9iii) drop 1 probably
Thanks
7. For question 7iii) I differentiated the equation and then simplified it but I forgot to put it equal to 0. How many marks would I lose?
8. I got 65 out of 72 what UMS might that be?

What was 100 last year?
9. Hi Sir, for 6iii) I found the sum to N of the geometric instead of the arithmetic series (so my inequality was sum to N of the geometric > sum to infinity of geometric). I then tried to solve this by trial and error. Would I get just 1/6 for correctly calculating the sum to infinity of the geometric or would I get another mark somewhere?

Also could you explain the answer to 9ii)? Thank you.
10. for 9 iii I squared the side which had root3cosax only. Then I substituted in 3(1-sin^2ax). I cant remember if it was ax but would that gain any marks???
11. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers May 2016

1. (i) 10 cm (2 marks)

(ii) 5.04 cm (2 marks)

2. (i) (2 marks)

(ii) (3 marks)

3. (i) (4 marks)

(ii) (2 marks)

4. (i) (2 marks)

(ii) (4 marks)

5. (a) (3 marks)

(b) (i) (4 marks)

(ii) 4 (1 mark)

6. (i) (3 marks)

(ii) (2 marks)

(iii) (6 marks)

7. (i) Quotient and remainder 0 (3 marks)

(ii) or or (3 marks)

(iii) Show (2 marks)

(iv) (4 marks)

8. (i) Translation by 2 units in the positive x direction (2 marks)

(ii) Stretch parallel to the y axis scale factor (2 marks)

(iii) Sketch showing as the only point of intersection (2 marks)

(iv) (3 marks)

(v) 9.60 (3 marks)

9. (i) (1 mark)

(ii) and (3 marks)

(iii) and (4 marks)

Sorry guys I made a mess of 9(ii) at the start - I didn't notice k had to be positive. It's right now.
Will you be making one for edexcel maths paper 1?

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12. For question 6iii, if I used the right method, used the formula for sum of the arithmetic sequence, calculated sum to infinity plugged in the numbers and made it > than a sum to infinity, but ended up with the wrong value of N, so I went wrong somewhere in my calculations, how many marks would I get?
13. (Original post by ScienceFantatic)
Will you be making one for edexcel maths paper 1?
I was thinking about doing so tomorrow but I don't want to get involved with the embargo breaking that is currently going on so I think I'll just give it a miss.
14. (Original post by Nikita_2313)
For question 6iii, if I used the right method, used the formula for sum of the arithmetic sequence, calculated sum to infinity plugged in the numbers and made it > than a sum to infinity, but ended up with the wrong value of N, so I went wrong somewhere in my calculations, how many marks would I get?
Drop 1 or 2.
15. For q3 part 2 I wrote the wrong constant (used 3 instead of 27) I'm guessing that's no marks but wanted to check to see if anyone thinks they could give a mark for right method?
16. Sorry I'm still confused about -3 not being a solution to 4 (ii) - why isn't 2log3(-3) = log9?
17. (Original post by bluegirl64)
Sorry I'm still confused about -3 not being a solution to 4 (ii) - why isn't 2log3(-3) = log9?
Try putting log(-3) on your calculator, its invalid
18. (Original post by aiman_)
Mr M I am so sorry for asking this in an a level thread but can you pleaseeeee make a mark scheme for the edexcel mathematics A exam higher that we did today pleaseeee, I really want to get an accurate judgement about how I did today so that I can see how many marks I need to get an A* overall.

Than you soooo much!!
Other people have already done this.
19. (Original post by cherrybirds)
Try putting log(-3) on your calculator, its invalid
thanks for replying - yep I was wondering why it's invalid, and why for 2log3(-3) the power 2 wouldn't 'go up' and square the -3 as it would a positive number?
20. (Original post by bluegirl64)
thanks for replying - yep I was wondering why it's invalid, and why for 2log3(-3) the power 2 wouldn't 'go up' and square the -3 as it would a positive number?
But that's in a different form. The question asked for it to satisfy whatever it was, and x = -3 did not since you can't have negative logs

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