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# C1 MEI Wednesday 16th May 2012 Tweet

Maths exam discussion - share revision tips in preparation for GCSE, A Level and other maths exams and discuss how they went afterwards.

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1. Re: C1 MEI Wednesday 16th May 2012
Yeahhh thats what I got, but someone earlier put the signs the other way around so I was baffled
2. Re: C1 MEI Wednesday 16th May 2012
I thought it was really easy compared to other Core 1 exams in the past.
3. Re: C1 MEI Wednesday 16th May 2012
What was the answer to the last question?
you had to draw the quadratic cruve and write down the coordinates of the roots?????
4. Re: C1 MEI Wednesday 16th May 2012
(Original post by superduperr)
no dont think so...
why? First I multiplied the left by 3/2. Then transferred the c across, then squared rooted it ? ?
5. Re: C1 MEI Wednesday 16th May 2012
I sware it was -5<k<5 not square root of it?

Does anyone remember the question/numbers?
6. Re: C1 MEI Wednesday 16th May 2012
(Original post by Axion)
why? First I multiplied the left by 3/2. Then transferred the c across, then squared rooted it ? ?
Yeah, you should have got 3a/2c all square rooted.

I certainly did
7. Re: C1 MEI Wednesday 16th May 2012
(Original post by abdus110)
no ppl it is -20 whetever question u on about cause i checked it on my graphics calculator afterwards and askd the teacher that 2x-5 whatever is crap
You obviously didn't ask your teacher as for him to tell you that is utter crap
8. Re: C1 MEI Wednesday 16th May 2012
Oh God can someone please tell me if I've failed, for that graph question i didn't know you had to multiply by 2. I got y = (x+1/2)(x+2)(x-5) and then I carried on using that for all the next questions, so my graph had intercept at -5, and I got -20 for that new intercept question instead of -40 Isn't that like a dozen or more marks gone? Also for the translation by 3 units to right I got (x-2.5)(x-1)(x-8). I really need some consolation please
9. Re: C1 MEI Wednesday 16th May 2012
(Original post by genius017)
What was the answer to the last question?
you had to draw the quadratic cruve and write down the coordinates of the roots?????
I got something like

3/2 + root5 /2 and
3/2 - root5 /2
10. Re: C1 MEI Wednesday 16th May 2012
(Original post by Axion)
why? First I multiplied the left by 3/2. Then transferred the c across, then squared rooted it ? ?
What was the original formula again?
11. Re: C1 MEI Wednesday 16th May 2012
(Original post by alex7892)
I sware it was -5<k<5 not square root of it?

Does anyone remember the question/numbers?
It was 4k^2 - 20 < 0

4k^2 < 20
k^2 < 5
k < +/-root 5

Then turn that into an equality, that's how I did it. I confused myself though because I had k as both less than + and - root 5, so I rearranged a bit to try and get an actual answer, ending up at -root5 < k < root5
12. Re: C1 MEI Wednesday 16th May 2012
(Original post by superduperr)
omg that is annoying! why didnt i see that :'(
2/3 x 3/2 is 1 therefore surely mine and alloties answers are correct?
13. Re: C1 MEI Wednesday 16th May 2012
(Original post by henshin)
Oh God can someone please tell me if I've failed, for that graph question i didn't know you had to multiply by 2. I got y = (x+1/2)(x+2)(x-5) and then I carried on using that for all the next questions, so my graph had intercept at -5, and I got -20 for that new intercept question instead of -40 Isn't that like a dozen or more marks gone? Also for the translation by 3 units to right I got (x-2.5)(x-1)(x-8). I really need some consolation please
You may have got error carried forward for your results, so lost most marks on the first one but as long as you use the numbers you got correctly you can still pick up marks. I hope you did, good luck
14. Re: C1 MEI Wednesday 16th May 2012
(Original post by GreenLantern1)
What was the original formula again?
a = 2/3b^2c
15. Re: C1 MEI Wednesday 16th May 2012
(Original post by George_)
It was 4k^2 - 20 < 0

4k^2 < 20
k^2 < 5
k < +/-root 5

Then turn that into an equality, that's how I did it. I confused myself though because I had k as both less than + and - root 5, so I rearranged a bit to try and get an actual answer, ending up at -root5 < k < root5
lol complete flop then
16. Re: C1 MEI Wednesday 16th May 2012
(Original post by Axion)
2/3 x 3/2 is 1 therefore surely mine and alloties answers are correct?
No, you divide a by 2/3 thirds, which is the same as multiplying a by 3/2. You don't multiply the fractions together.
17. Re: C1 MEI Wednesday 16th May 2012
(Original post by Axion)
lol complete flop then
I'm sure you did fine!
18. Re: C1 MEI Wednesday 16th May 2012
a = 2/3b^2c

3a = 2b^2c
3a/2 = b^2c
3a/2/c = b^2 which is rearranged to 3ac/2
so b = squareroot of 3ac/2

19. Re: C1 MEI Wednesday 16th May 2012
(Original post by George_)
No, you divide a by 2/3 thirds, which is the same as multiplying a by 3/2. You don't multiply the fractions together.
To get rid of 2/3 on one side you times the other by 3/2 ,no?
20. Re: C1 MEI Wednesday 16th May 2012
Can someone start an unofficial mark scheme and everyone adds to it?

Thanks also for the -root5<k<root5 question how many marks would I lose if I wrote root5<K and -root5>K
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