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# Mr M's OCR (not OCR MEI) Core 1 answers May 2012 Tweet

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1. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
Cheers Mr M for 5ii) I said translation (4 0) <----- zero underneath the 4. Would that be okay? Also question 6, I did everything correctly except got the wrong gradient, how many marks would the be worth?
2. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
Mr M,

You're a top bloke doing this by the way

For 9. ii. why were the inequalities , and not ? Surely "between" is exclusive? Would it matter if I put the latter? (hey, that rhymes..) And if so how many marks would I lose?

Cheers buddy
Last edited by tinytadpoletim; 16-05-2012 at 17:40.
3. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
Hey Mr M.

For Q7) basically i worked it all out and got my y value to be 3 +- root 7 .. i left it at that..

because i forgot to put it back into my equation and if i did then i would have got the right answer..

which should have 16 +- square root something ...

How many would i have lost?
Probably lose 2 marks
4. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
(Original post by The Moleman 99)
Cheers Mr M for 5ii) I said translation (4 0) <----- zero underneath the 4. Would that be okay? Also question 6, I did everything correctly except got the wrong gradient, how many marks would the be worth?
solve
5. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
(Original post by The Moleman 99)
Cheers Mr M for 5ii) I said translation (4 0) <----- zero underneath the 4. Would that be okay? Also question 6, I did everything correctly except got the wrong gradient, how many marks would the be worth?
translation definitely fine

probably drop 2 marks for 6
6. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
MM are y0u sure y0ur answer t questi0n 6 is right?
7. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
Mr M,

You're a top bloke doing this by the way

For 9. ii. why were the inequalities , and not ? Surely "between" is exclusive? Would it matter if I put the latter? (hey, that rhymes..) And if so how many marks would I lose?

Cheers buddy
between includes the boundary values - I think you might get lucky and the examiner will allow your version
8. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
(Original post by jamieward)
MM are y0u sure y0ur answer t questi0n 6 is right?
yes I graphed it to check
9. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
(Original post by Mr M)
between includes the boundary values - I think you might get lucky and the examiner will allow your version
By the way, it's okay to write 1.4 and 4.8 as fractions.. right?
10. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
**** i differenitated it wrong, how much marks lose?
11. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
By the way, it's okay to write 1.4 and 4.8 as fractions.. right?
Yes, that's fine (been answered by the big man himself)

Mr M, hi!

Thanks for this mark scheme by the way, very helpful!

I have a question about 9.i. the question about the area of the rectangle. I included the negative value for x (so put down -7<x<4). I thought about it long and hard during the exam, but decided to include the negative value.

How certain are you that this would be docked a mark? Did you feel any ambiguity in this question, or am I very clearly wrong? Thank you very much!
12. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
when i drew the graph y = sqrt(x), i drew the line in the right quadrant but more of an increasing gradient, however slightly, and checking wolfram it seems to be a gradually decreasing gradient, will that matter
13. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
For question (6), if you differentiated it incorrectly, but the remaining method was fine, how many marks would you get out of 7? Thanks
14. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
On the last question, I solved it simultaneously, tried to solve using the quadratic formula and showed that it couldn't be solved since you had to square root a negative. So that's how I explained why y=2x didn't meet the circle, is that the correct method?
15. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
What was question 8 i)?
16. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
(Original post by bhoyjd)
On the last question, I solved it simultaneously, tried to solve using the quadratic formula and showed that it couldn't be solved since you had to square root a negative. So that's how I explained why y=2x didn't meet the circle, is that the correct method?
yes.
17. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
(Original post by kenann)
when i drew the graph y = sqrt(x), i drew the line in the right quadrant but more of an increasing gradient, however slightly, and checking wolfram it seems to be a gradually decreasing gradient, will that matter
Yeah, sorry.

Pretty sure it's one mark for the right shape, one mark for the right quadrant.
18. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
By the way, it's okay to write 1.4 and 4.8 as fractions.. right?
of course
19. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
(Original post by 117r)
Yes, that's fine (been answered by the big man himself)

Mr M, hi!

Thanks for this mark scheme by the way, very helpful!

I have a question about 9.i. the question about the area of the rectangle. I included the negative value for x (so put down -7<x<4). I thought about it long and hard during the exam, but decided to include the negative value.

How certain are you that this would be docked a mark? Did you feel any ambiguity in this question, or am I very clearly wrong? Thank you very much!
Definitely drop 1 mark. The question was set to test your misconception.
20. Re: Mr M's OCR (not OCR MEI) Core 1 answers May 2012
(Original post by Mr M)
Mr M's OCR (not OCR MEI) Core 1 answers May 2012

7. (6 marks)

I got the answer but did

How many marks would I lose? It's the unsimplifed version...
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