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# FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST Tweet

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1. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by Moiraclaire)
Also your circle chould go through the origin, in my opinion, there might even be a mark for it. 4^2 + 2^2 = 20
Honestly tell me did you used a graphical calc?

I feel that people using a graphical calc would have easily noticed that it passes through the origin.
2. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
I didn't separate the variables on 7b :/ would I get any marks?
3. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
Made one mistake. On question number 5, taylor series, I differentiated incorrectly - didn't square the dy/dx in the third derivative, hence getting 8 instead of 32 for it. I carried on with the eight, getting everything the same but the factor of the ^3 term. How many marks lost do you guys recon? (I need something like 96/97 UMS on this
4. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
I didn't find the paper overly easy, and was pressed for time. Stupidly I crossed out some of my polar coordinates working which was RIGHT any slim chance of getting any marks??
5. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
Lol I did 7b by inspection and got the right answer, hopefully I wont lose too many marks for method :P
6. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by Gibbo81)
Here are the solutions. I thought the paper was pretty easy.

If anyone spots any mistakes just let me know and I'll correct them (it's too early in the morning for further pure maths!)
Thanks Gibbo. For Q7c I calculated k using y=2 and x=1; I then differentiated the function and put x=1 into that to get a value. Would I lose both marks or could I get one for method? I mean, there's no reason why doing this shouldn't work...
7. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by raheem94)
Honestly tell me did you used a graphical calc?

I feel that people using a graphical calc would have easily noticed that it passes through the origin.
The modulus of 4,-2 gave the same length as the radius of the circle.
That would be my suggestion.
I think messing about with a graphical calculator was not time efficient.
8. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
I messed this up pretty badly, I could have dropped up to 30 marks depening on how many I get for working.

I got the centre of the circle as +2 on the last question, and so all the rest of the question is wrong.

I think i forgot to divide by two on the second differential equations question

I got the d3y/dx3 bit slightly wrong on the taylor series and so my last term is wrong, I forgot to square the dy/dx, when differentiating 2y dy/dx or something

the complex number one is pretty annoying since I got the first bit wrong which means the rest of the question is wrong
Last edited by JJAS; 23-06-2012 at 09:25.
9. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
On q7 for dy/dx you can simply sub it into the first part given in the question.
10. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by rubbermat)
On q7 for dy/dx you can simply sub it into the first part given in the question.
Yeah I can see that now! I'll ask the same question I asked Gibbo if you don't mind: For Q7c I calculated the constant from part (b) using y=2 and x=1; I then differentiated the function and put x=1 into that to get a value. Would I lose both marks or could I get one for method? I mean, there's no reason why doing this shouldn't work...
11. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by rubbermat)
The modulus of 4,-2 gave the same length as the radius of the circle.
That would be my suggestion.
I think messing about with a graphical calculator was not time efficient.
I don't have a graphical calc, so don't know if it takes time. But i feel that those who use graphical calc have a huge advantage in such questions, due to which i feel these calculaters should be banned.

I know it can be noticed, but its not easy to recognize it. Not everyone will think about it, even Gibbo81 didn't notice it!
12. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by rubbermat)
The modulus of 4,-2 gave the same length as the radius of the circle.
That would be my suggestion.
I think messing about with a graphical calculator was not time efficient.
My graph was a bit messy and it looked like it was going through teh origin. (Unintentionally). Wonder if I'll get the mark.

But I didn't draw on the 3pi/4 angle. Hope there isn't a mark for that. Had the halfline going in the right direction.
13. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
OH FOR ****S SAKE. Last question, I dropped a sign somewhere and had (4,2) for the centre of my circle. Which began the domino effect meaning my graph was partially wrong and I couldn't get part c) because I kept on getting some weird answers. FFS 1 sign = 10 marks lost. ****s sake. And I need an A* as well to get into uni.

Out of 14, how many marks do you think I would get? I'm not sure where I turned the + sign into a minus, but using proper technique I got to a circle equation (4,2) with radius root20.

I then sketched that circle and the arg line. How many marks out of 10 would that get me? 2 at least for the arg line? How about the dropped sign in the circle? How much out of 6?

Also, Q.7 was also a bit of a mess. I got up to ln (function of v) = ln x+ A. But, made a hash of it from there on. How many marks will I get for reaching that point minimum?

EDIT: Q.7 I actually reached the point where 1/2A^2 was replaced with K. I didn't do that hence I couldn't complete the question properly. But I should get most of the marks for that right?
Last edited by zxh800; 23-06-2012 at 09:33.
14. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by zxh800)
OH FOR ****S SAKE. Last question, I dropped a sign somewhere and had (4,2) for the centre of my circle. Which began the domino effect meaning my graph was partially wrong and I couldn't get part c) because I kept on getting some weird answers. FFS 1 sign = 10 marks lost. ****s sake. And I need an A* as well to get into uni.

Out of 14, how many marks do you think I would get? I'm not sure where I turned the + sign into a minus, but using proper technique I got to a circle equation (4,2) with radius root20.

I then sketched that circle and the arg line. How many marks out of 10 would that get me? 2 at least for the arg line? How about the dropped sign in the circle? How much out of 6?

Also, Q.7 was also a bit of a mess. I got up to ln (function of v) = ln x+ A. But, made a hash of it from there on. How many marks will I get for reaching that point minimum?
I did exactly the same thing on the circle question, but I messed up 2 other questions as well
15. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by raheem94)
I don't have a graphical calc, so don't know if it takes time. But i feel that those who use graphical calc have a huge advantage in such questions, due to which i feel these calculaters should be banned.
Graphical calculators can't graph circles unless a programme is installed. This is because the graphing function must have y as the subject of the equation, and there's no ± key to allow the rearranged form of the circle.
16. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by JJAS)
I did exactly the same thing on the circle question, but I messed up 2 other questions as well
It's so frustrating. A little thing like that will drop me down from potentially 95 ums to a borderline A
17. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by zxh800)
It's so frustrating. A little thing like that will drop me down from potentially 95 ums to a borderline A
I just made 3 small errors and I'm not even sure I'll get a B, especially with everyone saying the paper is easy
18. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by snow leopard)
Graphical calculators can't graph circles unless a programme is installed. This is because the graphing function must have y as the subject of the equation, and there's no ± key to allow the rearranged form of the circle.
Didn't knew about it, thanks for informing.
19. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by Peter8837)
Thanks Gibbo. For Q7c I calculated k using y=2 and x=1; I then differentiated the function and put x=1 into that to get a value. Would I lose both marks or could I get one for method? I mean, there's no reason why doing this shouldn't work...
I did this, I differentiated the function, it took a page and a half, and still got the correct answer
20. Re: FP2 EDEXCEL Friday 22nd June PM - SOLUTIONS IN FIRST POST
(Original post by snow leopard)
Graphical calculators can't graph circles unless a programme is installed. This is because the graphing function must have y as the subject of the equation, and there's no ± key to allow the rearranged form of the circle.
Casio does it fine.
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