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# CCEA A2 maths - C3 20th may 2016

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1. (Original post by Blobfish13)
I got 0.230 I think???
I think I got that too

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2. (Original post by Smcdonald98)
Was it not proving it was always positive? I completed the square
yeah, didn't think of that, hopefully scrape a few marks in it
3. (Original post by harrytqo)
how were you meant to prove always negstive for 7 part i and ii??
Complete to square in each part

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4. For the partial fractions, i think i got 1 - 1/x - 1/x^2 + 2/(x-1)
5. (Original post by Smcdonald98)
For the partial fractions, i think i got 1 - 1/x - 1/x^2 + 2/(x-1)
i got exactly that happy days
6. (Original post by Blobfish13)
I got 0.230 I think???
i got something like that too! cant remember exactly but mine worked
8. (Original post by Sparklez10)
i got something like that too! cant remember exactly but mine worked
I got 0.230 as well
9. For 7 I used the discriminant to show it didnt cross the x axis then picked a value to show it was positive.
10. What did you guys do for 7 part ii? I differentiated it twice to see if d2y/dx2 was greater than 0 but not sure if thats correct
11. (Original post by Smcdonald98)
What did you guys do for 7 part ii? I differentiated it twice to see if d2y/dx2 was greater than 0 but not sure if thats correct
I differentiated and manipulated it until it became -2(x^2-x+2)/e^(2x). The bit in the bracket was what we proved as always positive in 7(i) and e^(2x) is always positive. The -2 means that its always negative.
12. (Original post by iam_joshedwards)
I differentiated and manipulated it until it became -2(x^2-x+2)/e^(2x). The bit in the bracket was what we proved as always positive in 7(i) and e^(2x) is always positive. The -2 means that its always negative.
I did that as well but differentiated again, how many marks do you reckon i'll lose?
13. does everyone reckon grade boundaries will be low because it was a stinkin paper? like i did all the past papers and 5/6 of them twice and still found the paper v difficult!
14. (Original post by Sparklez10)
does everyone reckon grade boundaries will be low because it was a stinkin paper? like i did all the past papers and 5/6 of them twice and still found the paper v difficult!
I hope so I'm pretty certain I got about 62 but don't know if that would even be close to an A😕

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15. (Original post by TomFitness)
I hope so I'm pretty certain I got about 62 but don't know if that would even be close to an A😕

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yeah i think i may have gotten around 60-62 too!! i know everyone in my school came out of the exam having found it very difficult so hopefully that shows in low grades!!!!
16. (Original post by Sparklez10)
yeah i think i may have gotten around 60-62 too!! i know everyone in my school came out of the exam having found it very difficult so hopefully that shows in low grades!!!!
It will technically be at least an A as 60/75 is 80% (and we can assume grades will definitely not be scaled down) but it's pretty **** that getting an A* now is going to be very hard. Even looking at past papers any of them would never require you to form an equation like qu6. I'm just ranting now😐

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17. Ok that was definitely the hardest c3 by far, they have to lower the grade boundary for that. I was really hoping for an A* as well but it seems like i got around 66/75. Looks like ill have to ace c4 now.
18. I'm hoping an a* will be 67 since it was a hard paper
20. anyone got the paper?

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