OCR A2 (Non-MEI) C4 Exam - 18th June 2014

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Reply 180

Fly96

for the a+bln3+cln4 anyone else get -6 for a??

-20/3 - 18ln3 +32ln4

Original post by Jorrey10

I couldn't do that vector question with the angle because I didn't know what it meant by 'angle between the diagonals' so I just decided to find the angle between OA and OC and got 84 or something? Anyone else do this? I think it's wrong and it was out of 5 marks... so how many do you think I will get if I found all the lengths of the sides (to try to get working marks haha) and then did the scalar product between the (potentially wrong) sides? 3/5? 2/5?

I got 84.7?

Reply 183

Myer

Original post by Elizabeth1414

Grade boundary predictions?

hopefully 20 for an A?

****

Original post by Fly96

for the a+bln3+cln4 anyone else get -6 for a??

I got 12 I think.. :s-smilie:

Reply 186

OliverG

Original post by silvi6

I worked out OM and CM (where M is where the diagonals cross) and then did scalar product of the two vectors :smile:

I got
81.7

Balls. I got like 85 By doing OB and OC

And for the very last question did anybody get an answer of around 2000 ish?

Reply 187

iDraw

Original post by versebe

My numerical/equation answers (in order) are:

Simplified fraction: (-x^3 + 3) / ((1 + x)(1 - x))

Angle between diagonals: 81.7 degrees (?)

Binomial expansion: 1 + x + (3/2)x^2

Coefficient: 5.5

Stationary coordinates: (-2,2) and (10,2)

Stationary coordinate: (1,3/2)

Cartesian form: y = -(1/2)x^2 + x + 1

Integration: -20/3 - 18ln3 + 32ln4

h = (-27T/400pi + 729/8)^(1/3)

71 minutes

I got most of these answers!

Reply 188

kelvinbeyioku

Original post by StephenJHolmes

Guess I'm not going to uni this year...

ditto

Reply 189

Substitution

Original post by Myer

hopefully 20 for an A?

that high?

Reply 190

cathrg26

Original post by des1001

would you say having it expanded out and simplified is enough, without actually stating the coefficient? for bionomial one?

Might miss out a mark (A1) cos you haven't actually answered the question

Reply 191

The_Blade

i countd up my marks and lost 39... did all ****ing papers from 2005 and ****ed up

Reply 192

Farringtonn

How did you do the prove one where it was like 1/2ln2 or something. I changed it in to sin2x and cos2x but couldn't get the answer?

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Reply 193

000alex

What did people get for the partial fractions ? I kept redoing it and got my "B" as 0 ? Anyone else?

Reply 194

Jorrey10

crap. just remembered i left the 'h in terms of t' question as 1/3h^3 = ...... and didn't make it h = ..... as i thought it would look more simplified that way... do you think that will lose me marks?

Reply 195

Farringtonn

Original post by The_Blade

i countd up my marks and lost 39... did all ****ing papers from 2005 and ****ed up

Don't worry I missed like 30 marks and that's not counting the stuff I got wrong

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Reply 196

Farringtonn

Original post by 000alex

What did people get for the partial fractions ? I kept redoing it and got my "B" as 0 ? Anyone else?

Yeah 0, thought I did it wrong checked it twice.

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Reply 197

OliverG

Original post by Farringtonn

How did you do the prove one where it was like 1/2ln2 or something. I changed it in to sin2x and cos2x but couldn't get the answer?

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