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FP3 June 2014 R paper

Can someone help me with question 8 for the june 14 R paper?

I don't understand why they have changed the signs from -2i-11j+5k to 2i+11j-5k

Also for the second part of the question it only works if in the first part you eliminated the X variable and I don't understand why?

https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf

https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf
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Avatar for TeeEm
TeeEm
19
Original post by Teddysmith123
Can someone help me with question 8 for the june 14 R paper?

I don't understand why they have changed the signs from -2i-11j+5k to 2i+11j-5k

Also for the second part of the question it only works if in the first part you eliminated the X variable and I don't understand why?

https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf

https://3a14597dd5c7aa2363f067571766...%20Edexcel.pdf


the answer to the first question is because it is neater

part b I do not understand what exactly is the problem.
Original post by TeeEm
the answer to the first question is because it is neater

part b I do not understand what exactly is the problem.


So I wrote the equation for part a by eliminating the z variable so my coordinates are different but are correct because it is shows in the marks scheme. But the question only works if you had eliminated x in the first part and I was wondering why

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Avatar for TeeEm
TeeEm
19
Original post by Teddysmith123
So I wrote the equation for part a by eliminating the z variable so my coordinates are different but are correct because it is shows in the marks scheme. But the question only works if you had eliminated x in the first part and I was wondering why

Posted from TSR Mobile


you can eliminate anything ... the parametric equation of a line is not unique
the intersection of the three planes, which is essentially the intersection of a line with the third plane will be unique regardless...

FP3R, June 2014, page 7.jpg

Marking schemes are not for students.
Original post by TeeEm
you can eliminate anything ... the parametric equation of a line is not unique
the intersection of the three planes, which is essentially the intersection of a line with the third plane will be unique regardless...

FP3R, June 2014, page 7.jpg

Marking schemes are not for students.


Thanks I understand now where I went wrong!
Reply 5
Avatar for TeeEm
TeeEm
19
Original post by Teddysmith123
Thanks I understand now where I went wrong!


no worries
Original post by TeeEm
no worries



Sorry to bother you again, but I was wondering if you could help me with 2 more questions?

I don't understand question 6 for the june 2014 paper as I don't know how to simplify the gradient to solve the proof or find the center of the chord for part c.

Also, for question 9, in the reduction formula I understand how to do it, but I just wanted some clarification on what x^2=x^2-1=1 meant? - In the mark scheme it shows this is used to separate the bracket into 2 and I was just hoping you could explain why and how to use it?

https://3a14597dd5c7aa2363f0675717665774b02557b0.googledrive.com/host/0B1ZiqBksUHNYQWE5bVRTVE9BLW8/June%202014%20QP%20-%20FP3%20Edexcel.pdf

https://3a14597dd5c7aa2363f0675717665774b02557b0.googledrive.com/host/0B1ZiqBksUHNYQWE5bVRTVE9BLW8/June%202014%20MS%20-%20FP3%20Edexcel.pdf

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