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# OCR MEI - C1 - 13th May 2015 watch

1. (Original post by pierre225)
On the earlier question of (25/9)^-1/2 I only put 3/5 instead of + or -
I'll probably lose a mark won't I
No powers only have one value bro

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2. (Original post by jpetersgill)
No powers only have one value bro

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But it's a square root so wouldn't it be + or -?
3. NGL I was resitting and still found Q12 ridiculously hard.
4. (Original post by pierre225)
But it's a square root so wouldn't it be + or -?
No, to the power of 1/2 means the positive square root

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5. (Original post by fudgeboy989)
What ums would 70/72 roughly be?

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0 ums mate i think i lost 3 marks :'( probably lost like 3 4 ums
Just do well in C2 and S1 and you're sorted
6. (Original post by pierre225)
81x^4 - 216x^3 + 216x^2 -96x +16 I think was the binomial
I got that but forgot to put the minuses ARGGG im so angry at myself!!! How many marks do you think i will lose for that?

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7. Can someone please tell me how many marks I would lose on that question and follow on questions for putting the minimum point as (-2,9) and so the complete the square bit as 3(x+2)^2+9????
8. (Original post by jpetersgill)
No powers only have one value bro

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Would I lose a mark for putting + or - if it isn't needed?
9. (Original post by Arkasia)
NGL I was resitting and still found Q12 ridiculously hard.
You have to know the discriminant stuff to get it I only revised those type of questions a couple days ago, got pretty lucky
10. (Original post by pierre225)
You have to know the discriminant stuff to get it I only revised those type of questions a couple days ago, got pretty lucky
How many people do you reckon got Q12?
11. I got different answers for 5 and 6 but everything else looks fine
12. (Original post by jpetersgill)
No, to the power of 1/2 means the positive square root

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Ah nice hopefully I'll lose less marks than I thought then! Still annoyed I got the proof wrong for x^2 is an integer <-> x is an integer. Such a silly mistake
13. (Original post by Arkasia)
How many people do you reckon got Q12?
Not many and certainly not many year 12s so grade boundaries take that into account
14. (Original post by pierre225)
Not many and certainly not many year 12s so grade boundaries take that into account
Fingers crossed then aha
15. (Original post by AlexParmenter)
Would I lose a mark for putting + or - if it isn't needed?
No it isn't necessary unless you are doing the quadratic formula
16. (Original post by jpetersgill)
Wtf I didn't get that lol I got k>14/3

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Oops i did it wrong
I forgot that there was already a minus where there was C-K
That's another 4 marks gone
17. (Original post by AlexParmenter)
Would I lose a mark for putting + or - if it isn't needed?
No, the mark schemes say ignore +- for those questions

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18. Didnt the question ask for f(g) in its factorised form?? Or was it for the other roots??
19. Can someone please tell me how many marks I would lose on that question and follow on questions for putting the minimum point as (-2,9) and so the complete the square bit as 3(x+2)^2+9????

🙏🏻🙏🏻 how many marks was each part worth
20. (Original post by Rik21)
Stress. Would you have said that c was 13+k
When k>14/3
I'm confused by what you mean?
Seen as it was a positive parabola surely it would have to be k>something for 2 intersections!

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