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# Mr M's OCR (not OCR MEI) Core 1 Answers May 2015 watch

1. Mr M's OCR (not OCR MEI) Core 1 Answers May 2015

1. (3 marks)

2. (i) Curve in second and fourth quadrants (2 marks)

(ii) (2 marks)

(iii) Stretch parallel to y axis (or x axis) scale factor (2 marks)

3. (i) (1 mark)

(ii) (2 marks)

(iii) (2 marks)

4. or (5 marks)

5. (i) 5 (2 marks)

(ii) (7 marks)

6. and or and (5 marks)

7. (a) (4 marks)

(b) (4 marks)

8. (i) U shaped parabola passing through , and (4 marks)

(ii) or (2 marks)

(iii) (3 marks)

9. (i) (5 marks)

(ii) Minimum (2 marks)

(iii) (3 marks)

10. (i) Centre and radius 5 (3 marks)

(ii) Show ... (5 marks)

(iii) 40 square units (4 marks)
2. for 8iii) i wrote b^2 - 4ac< 0 , then worked it out but put k >25 instead of the other way round k<-25.

How many marks do you expect me to get from that?
3. (Original post by ccfctom)
for 8iii) i wrote b^2 - 4ac< 0 , then worked it out but put k >25 instead of the other way round k<-25.

How many marks do you expect me to get from that?
1 mark for using the discriminant.
4. thanks for this! ^^

edit: any chance you're doing OCR FP1?
5. Isn't 2ii incorrect?
6. I left 2ii) as -1/(x-2) do you think I'll lose a mark for this?
7. Ahh okay I'm sure I achieved 60-63 hmm, I wonder what the boundary for an A will be! What do you believe in your opinion? (And thankyou!)
8. (Original post by AlfieH)
Isn't 2ii incorrect?
over (x-2) is it?
9. (Original post by jackpethick)
over (x-2) is it?
The original curve was -1/x therefore if it was a translation +2 units in the x direction the new equation would be -1/x-2?
10. (Original post by higgin97)
I left 2ii) as -1/(x-2) do you think I'll lose a mark for this?
No.
11. (Original post by AlfieH)
Isn't 2ii incorrect?
No.

You have probably written . This is exactly the same.
12. (Original post by AlfieH)
The original curve was -1/x therefore if it was a translation +2 units in the x direction the new equation would be -1/x-2?
That's the same as the answer. Multiply numerator and denominator by -1.
13. (Original post by nobodycarescarla)
Ahh okay I'm sure I achieved 60-63 hmm, I wonder what the boundary for an A will be! What do you believe in your opinion? (And thankyou!)
I've no idea and I don't like to guess. We'll just have to wait and see.
14. (Original post by Mr M)
No.

You have probably written . This is exactly the same.
Ahh that makes sense, it's hard to remember what exactly i got. Cheers.
15. (Original post by Parallex)
thanks for this! ^^

edit: any chance you're doing OCR FP1?
Tomorrow evening I will.
16. (Original post by Mr M)
No.
Hi, are you doing any answers for the AQA C1 maths? Would be reeeeaaallly appreciated if so )
17. (Original post by Golem.)
Hi, are you doing any answers for the AQA C1 maths? Would be reeeeaaallly appreciated if so )
I only do OCR for A Level. Sorry.
18. (Original post by Mr M)
That's the same as the answer. Multiply numerator and denominator by -1.
I was misled then by google graphs since entering y=1/ 2-x gives a straight line graph.

EDIT: Forgot the brackets! Sorry for being a goon. Cheers!
19. (Original post by Mr M)
Tomorrow evening I will.
Thanks.
20. Is there any chance you could post the c1 paper?

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