Edexcel FP3 June 2015 - Official Thread

http://www.thestudentroom.co.uk/attachment.php?attachmentid=433599&d=1434974706

Original post by k9000

Anyone, please?? Was it correct to define two points in terms of parametric equations for starters?

Reply 885

username1432489

http://www.thestudentroom.co.uk/attachment.php?attachmentid=433599&d=1434974706

Original post by Gome44

So it definitely was Y=(-1/4m)X then? Cause it's like the same as lay years paper

Reply 886

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.

(edited 8 years ago)

Reply 887

username1259045

17

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

Reply 888

HMusa

1

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

Reply 889

username1259045

17

estimate for 80 ums??

Reply 890

username1432489

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!

Reply 891

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?

Reply 892

dijam

2

unofficial markscheme out yet?

Reply 893

Not sure if arsey does fp3 :/

Original post by dijam

unofficial markscheme out yet?

Reply 894

jelo

6

what was the equation for the plane?

Reply 895

Gome44

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

Reply 896

username1432489

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?

Reply 897

Elcor

14

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 :lol:

but unfortunately it was the weird surds

Reply 898