# Edexcel FP3 June 2015 - Official ThreadWatch

3 years ago
#881
(Original post by k9000)
How did everyone do the last question? Am i right in getting -0.5cot (beta-alpha/2) somewhere in my calculation or nah?
Anyone, please?? Was it correct to define two points in terms of parametric equations for starters?
0
3 years ago
#882
Anyone have a copy of the paper or the can remember the questions with marks?
0
3 years ago
#883
0
3 years ago
#884
honestly a really bad paper, i lost so marks, thankfully s2 was a lot better, i also think this paper was a lot different than previous years, there were like 3 "new" types of questions??? +room for silly mistakes
0
3 years ago
#885
(Original post by k9000)
Anyone, please?? Was it correct to define two points in terms of parametric equations for starters?
http://www.thestudentroom.co.uk/atta...9&d=1434974706
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3 years ago
#886
So it definitely was Y=(-1/4m)X then? Cause it's like the same as lay years paper
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3 years ago
#887
(Original post by Chazatthekeys)
Why would it be perpendicular?! Since it was the line through the 2 points you choose - I don't see why it would be perp.?
Doesnt the line go through the midpoints of the parallel lines of the chord. In this case it would be perpendicular, if you draw it out.
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3 years ago
#888
also initally i got the right eignevalues, but then at the end i thought it was wrong and multiplied everything out and got like 3,2,1 for the eigenvalues idek what to think anymore
0
3 years ago
#889
What the actual f*** was that paper? Most of it was OK except for 3 parts I'd never seen before in my life... 13 marks down the drain straight up there... At least S2 was better
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3 years ago
#890
estimate for 80 ums??
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3 years ago
#891
(Original post by chemlover12)
Doesnt the line go through the midpoints of the parallel lines of the chord. In this case it would be perpendicular, if you draw it out.
But doing it without the perp. You get y=(-1/4m)x, and if m<0 then y=+ax which it would

But if you do perp. You get y=4mx or something and if m<0, the line is going downwards when it should be going up!
0
3 years ago
#892
(Original post by Chazatthekeys)
But doing it without the perp. You get y=(-1/4m)x, and if m<0 then y=+ax which it would

But if you do perp. You get y=4mx or something and if m<0, the line is going downwards when it should be going up!
Oh god. How do you know the direction the line is going in?
0
3 years ago
#893
unofficial markscheme out yet?
0
3 years ago
#894
Not sure if arsey does fp3 :/
(Original post by dijam)
unofficial markscheme out yet?
0
3 years ago
#895
what was the equation for the plane?
0
3 years ago
#896
(Original post by Chazatthekeys)
So it definitely was Y=(-1/4m)X then? Cause it's like the same as lay years paper
I think so
0
3 years ago
#897
(Original post by chemlover12)
Oh god. How do you know the direction the line is going in?
Well I just assumed my A/B general points for the chord where such that the gradient would be -ve, so m<0 and if locus of midpoints, the gradient needs to be positive, so y=(-1/4m)x makes sense - in this sense

Does that make sense?
0
3 years ago
#898
I got 3,2,1 as well...It is wrong, I realised about 10 seconds after I left the exam. The pattern was [210][121][012]. And when you get the eigen values you had to do (2-L){(2-L)(2-L)-1} (and so on), but must've missed out the -1 like I did :/
(Original post by mmms95)
also initally i got the right eignevalues, but then at the end i thought it was wrong and multiplied everything out and got like 3,2,1 for the eigenvalues idek what to think anymore
I'm more annoyed that there were 2 question I left to do at the end which I COULD do but wasn't sure about, and completely forgot...Like I could've done the eigenvector and P^T AP question even with the wrong eigenvalues :'(

(Original post by mmms95)
also initally i got the right eignevalues, but then at the end i thought it was wrong and multiplied everything out and got like 3,2,1 for the eigenvalues idek what to think anymore
0
3 years ago
#899
I got 3,2,1 as well...It is wrong, I realised about 10 seconds after I left the exam. The pattern was [210][121][012]. And when you get the eigen values you had to do (2-L){(2-L)(2-L)-1} (and so on), but must've missed out the -1 like I did :/
(Original post by mmms95)
also initally i got the right eignevalues, but then at the end i thought it was wrong and multiplied everything out and got like 3,2,1 for the eigenvalues idek what to think anymore
I'm more annoyed that there were 2 question I left to do at the end which I COULD do but wasn't sure about, and completely forgot...Like I could've done the eigenvector and P^T AP question even with the wrong eigenvalues :'(
0
3 years ago
#900
(Original post by mmms95)
also initally i got the right eignevalues, but then at the end i thought it was wrong and multiplied everything out and got like 3,2,1 for the eigenvalues idek what to think anymore
That must have felt so good when you got those 'normal' eigenvalues but unfortunately it was the weird surds
0
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