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

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1. For the last question, i used the CAST diagram with 60 degrees and i got the same answers but in degrees rather than radians. How many marks will i lose?
Also, for 5bi, i got the answer but i ended up writing 4a^2 + 6a -2, would i lose any marks for doing that?
2. Hi

For question 3ii) How do you know what the constant was? I used 3, but i know now that it's wrong, can you show the method please.

If i left 9iii) as

x = (1/3π)/a

And

x = (4/3π)/a

would i still get full marks?

Thanks
3. (Original post by NotGambit)
For the last question, i used the CAST diagram with 60 degrees and i got the same answers but in degrees rather than radians. How many marks will i lose?
Also, for 5bi, i got the answer but i ended up writing 4a^2 + 6a -2, would i lose any marks for doing that?
Last question - you might only lose 1.

5bi. They *might* ignore subsequent working or you might lose some marks - I can't say really.
4. (Original post by Jusst Haris)
Hi

For question 3ii) How do you know what the constant was? I used 3, but i know now that it's wrong, can you show the method please.

If i left 9iii) as

x = (1/3π)/a

And

x = (4/3π)/a

would i still get full marks?

Thanks
The constant was given in part i) as part of the expansion.

You will probably get full marks on the last question.
5. For 8ii) I wrote stretch parallel to the x-axis by scale factor x/(x-2) will this get any marks because it produces the same graph or does it have to be in terms of numbers only and no variables?
6. (Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 2 Answers May 2016

8.
(ii) Stretch parallel to the y axis scale factor (2 marks)
How many marks would I lose for putting stretch parallel to the x axis scale factor 1/9?
How many marks would I lose for putting stretch parallel to the x axis scale factor 1/9?
Drop 1.
8. (Original post by grepole121)
For 8ii) I wrote stretch parallel to the x-axis by scale factor x/(x-2) will this get any marks because it produces the same graph or does it have to be in terms of numbers only and no variables?
Numbers are required.
9. Hi Sir,
If I used my answer for a from part ii in part iii but did the question with the correct method, how many marks would I get?
Thanks
10. (Original post by JamesK3000)
Hi Sir,
If I used my answer for a from part ii in part iii but did the question with the correct method, how many marks would I get?
Thanks
Question number? You need to give me a bit more to go on.
11. (Original post by Mr M)
Question number? You need to give me a bit more to go on.
Oh yeah sorry, it was for Q9, part iii
I used a as 5/3 for part iii when it said it was a different value
12. (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.
For 9iii when dividing by cosax does cosax=0 not become a solution
13. (Original post by JamesK3000)
Oh yeah sorry, it was for Q9, part iii
I used a as 5/3 for part iii when it said it was a different value
You might still get 2 marks in the final part.
14. (Original post by Mr M)
You might still get 2 marks in the final part.
Okay thank you
15. (Original post by Bobyhowars)
For 9iii when dividing by cosax does cosax=0 not become a solution
No.
16. (Original post by Mr M)
No.
Can you tell me why please
17. (Original post by Mr M)
It isn't a correct answer. There is a scale factor of 1/9 in 8ii.
Okay thank you, I did get 1/9 as the scale factor. Also, for question 5bi), I wrote -6/a + 2/a +4. Does it matter which order the terms go?
18. 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?
19. 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?
20. Anyone want to have a stab at the grade boundaries? I made many silly mistakes on this paper :/

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