Edexcel C2 20th May 2015 *Official Thread*

You did 192-34, but an area is impossible to be negative so u should have done 192 + 34

Does anyone remember how many marks it was to prove that C was a minimum for the last question. If it was one mark, what would you get the mark for? Because instead of subbing in my R value I subbed in C (483) but it still came out positive and said it was therefore minimum. Would I still get the mark?

on part a of the last question i didnt realise that u had to do the circumference x the length of the cylinder (not diameter) and thats why i got 300/r instead of 300pi/r how many marks would that lose??

You did 192-34, but an area is impossible to be negative so u should have done 192 + 34

so **** init rip

should have taken btec asdan tbh

i think it was 2 marks, so one for differentiation again, and a second for proving its a minimum

I did do it separately, I got 32 for the first value and 164 for the other

Q1was 16?


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It was 32* not 34 wasn't it?

i think it was 2 marks, so one for differentiation again, and a second for proving its a minimum

So here is my answer
Q1: 1024-1280x+720x square
Q2: (x-2) square -(y+1) square= 20
Part b i got gradient =1/2, x-2y-14=0
Q3: A=-96,B=-48
Fractorise =3(x-4)(x+4)(2x+1)
Q4:40.9 perimeter and 96.7 area
Q5: r=8/9,a=18,n=28
Q6=32+194=226
Q7:y=1/3 or y=3/2
Q8i/9,4pi/9,7pi/9
Cosx=1+/- square root of (1+16k) devided by 8
X=0, x=136.8 or 138.6 something,x=221.4
Q9: 483

anyoneeeee??

Was the area actually 226? That's what the majority of people got, but the smartest guy in our year disagrees


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Whos got bio tommorow?

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