How did other people answer part b of the reduction formula? 1 mark for putting limits, 1 mark for recognising the integral always is multiplied by I subscript 1 (ie I(1) and 1 mark for evaluating this and then 1 mark for conclusion?

Reply 970

anorris13

2

Original post by soundhippo

which uni gives an E offer... lmao

Its more likely that is what he needs to average an A or a B from last year's result

Reply 971

username1432489

10

I'm pretty confident these are the correct solutions - but I didn't have the question paper, and I've forgotten the vector question - I didn't remember the vectors A, B or C

Sorry if it's a bit messy

It's on this google drive (the file was too big):
https://drive.google.com/folderview?id=0B2yfoJrIQ5MCfk1LR0FuODlIaWEwdG1xTDZVZTJMTHk4X3pVQTgzNDR4c0x3U1ZDVElHeDA&usp=sharing

Reply 972

imusti96

Original post by Chazatthekeys

I'm pretty confident these are the correct solutions - but I didn't have the question paper, and I've forgotten the vector question - I didn't remember the vectors A, B or C

Sorry if it's a bit messy

It's on this google drive (the file was too big):
https://drive.google.com/folderview?id=0B2yfoJrIQ5MCfk1LR0FuODlIaWEwdG1xTDZVZTJMTHk4X3pVQTgzNDR4c0x3U1ZDVElHeDA&usp=sharing

For the last Question you did, you were meant to find the volume not the surface area

Reply 973

Elcor

14

This thread is dead compared to the other modules on the day of the exam, is the population of FP3 students that low?

For the last part, I found the general midpoint of two points on the ellipse using the coordinates of a general point on the ellipse and calling one angle alpha and one beta. I then found the gradient of the line from one point to the other (so everything's in terms of C3 double angles at this point). I subbed these into y-y1=(gradient)(x-x1) for the locus, but I'm pretty sure this is wrong because the gradient of the locus would be the inverse of the gradient of the line joining the 2 points. I stopped here.

How many marks (in your opinions) would this be out of 6? Or was it out of 5?

Reply 974

cogito.

12

Original post by imusti96

For the last Question you did, you were meant to find the volume not the surface area

The answer is correct, you are referring to another question.

Reply 975

imusti96

Original post by cogito.

The answer is correct, you are referring to another question.

Oh yah, my bad.

Reply 976

username1432489

10

Original post by imusti96

For the last Question you did, you were meant to find the volume not the surface area

No it definitely was arc length, the one before was volume of revolution

Reply 977

greetingsfrenz

6

Original post by LukeTownsend123

Reckon I've got around 50 marks. Maybe 55. What grade am I looking at?

55 an A. Even 51 for an A but could even be lower, everyone agrees this was a very hard paper

Reply 978

Dalek1099

21

I did awful on this paper my mark is definitely in the 50s(if I have got right what I think I got right) I didn't get very far in both of the last parts of question 8, when I was doing 8c I didn't even understand the question it was that hard and for 8b I was stuck with square roots of quadratics of x.For the triangle one I ended up with Cosh2t which isn't independent of x, I am not quite exactly sure how you were supposed to show that reduction formula result I evaluated I1=1 and then wrote I3 and I5 in terms of I1 and then just quoted the result, the pattern was obvious but I am not sure whether they wanted something more rigorous.Timing was a big problem on this paper(they wasted loads of our time by asking us to find 3 normalised eigenvectors) I didn't really have enough time at the end to fully have a good go at the question, I wasn't even sure how to represent the points I ended up just selecting points finding their midpoints and finding the line between them.

I did the June 2009 and got 75 and one of my friends did the June 2014 and didn't think it was too bad(I think the last question now might have been very similar to the hyperbola one on June 2014 but we got no help this time and grade boundaries for that were 55 for an A I think) so grade boundaries have got to be in the low 50s and I would not be surprised for an A to be in the 40s, it has happened on rare occasions.

Reply 979

xyzmaster

8

Original post by Dalek1099

I did awful on this paper my mark is definitely in the 50s(if I have got right what I think I got right) I didn't get very far in both of the last parts of question 8, when I was doing 8c I didn't even understand the question it was that hard and for 8b I was stuck with square roots of quadratics of x.For the triangle one I ended up with Cosh2t which isn't independent of x, I am not quite exactly sure how you were supposed to show that reduction formula result I evaluated I1=1 and then wrote I3 and I5 in terms of I1 and then just quoted the result, the pattern was obvious but I am not sure whether they wanted something more rigorous.Timing was a big problem on this paper(they wasted loads of our time by asking us to find 3 normalised eigenvectors) I didn't really have enough time at the end to fully have a good go at the question, I wasn't even sure how to represent the points I ended up just selecting points finding their midpoints and finding the line between them.

I did the June 2009 and got 75 and one of my friends did the June 2014 and didn't think it was too bad(I think the last question now might have been very similar to the hyperbola one on June 2014 but we got no help this time and grade boundaries for that were 55 for an A I think) so grade boundaries have got to be in the low 50s and I would not be surprised for an A to be in the 40s, it has happened on rare occasions.

Highly unlikely

Edexcel FP3 June 2015 - Official Thread

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