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# AQA A2 Mathematics MPC4 Core 4 - 9th June 2015 [Discussion & unofficial markscheme] watch

1. (Original post by CD223)
That's intense! What board are you on for physics!?

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2. (Original post by mamacita)
AQA hoping the papers are fair this year!

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3. (Original post by CD223)
AQA hoping the papers are fair this year!

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Hopefully! Good luck
4. (Original post by mamacita)
Hopefully! Good luck
You too! Are yours on the 11th and 18th?

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5. can somebody explain 7cii to me in words thanks. not sure what to do and why to do it.

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Attached Images

6. (Original post by the_googly)
can somebody explain 7cii to me in words thanks. not sure what to do and why to do it.

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• Lines L1 and L2 are perpendicular.
• P is the point of intersection.
• A lies on L1, B lies on L2.
• Isosceles triangles have two equal length sides.
• You have just worked out the length of AP squared in the previous question.
• As shown, B could lie in two possible positions for the length of AP to equal the length of BP.

In order to work out the two possible positions, use the line equation of L2 to work out the position vector OB in terms of mu. Then work out the vector PB (or BP) in terms of mu.

Use this information to form a quadratic equation in terms of mu to find the length of BP (or PB), setting it equal to AP squared (as the two lengths are equal).

Does this help? I can write a solution if needs be.

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7. (Original post by CD223)

• Lines L1 and L2 are perpendicular.
• P is the point of intersection.
• A lies on L1, B lies on L2.
• Isosceles triangles have two equal length sides.
• You have just worked out the length of AP squared in the previous question.
• As shown, B could lie in two possible positions for the length of AP to equal the length of BP.

In order to work out the two possible positions, use the line equation of L2 to work out the position vector OB in terms of mu. Then work out the vector PB (or BP) in terms of mu.

Use this information to form a quadratic equation in terms of mu to find the length of BP (or PB), setting it equal to AP squared (as the two lengths are equal).

Does this help? I can write a solution if needs be.

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can I ask where the O in OB comes from as there is no O on the graph

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8. (Original post by the_googly)
can I ask where the O in OB comes from as there is no O on the graph

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O is used to indicate the origin. The vector OB is the position vector of point B. In other words, the vector moved through to get from the origin of the graph at (0, 0, 0) to the point B.

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9. I've only just realised that C4 is a week away!!
Been doing loads of C3 assuming that I've got plenty of time for C4!
10. (Original post by lionelmessi19)
I've only just realised that C4 is a week away!!
Been doing loads of C3 assuming that I've got plenty of time for C4!
Lol yeah a week today and the core maths is over!

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11. (Original post by CD223)
Lol yeah a week today and the core maths is over!

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Its only a "bit" scary!
12. (Original post by lionelmessi19)
Its only a "bit" scary!
True! Did my last proper past paper for both exams today - just gonna do pilot papers from now on!

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13. (Original post by CD223)
True! Did my last proper past paper for both exams today - just gonna do pilot papers from now on!

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Did one of those today, they are quite harder than the normal past papers but its good practice

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14. (Original post by Jimmy20002012)
Did one of those today, they are quite harder than the normal past papers but its good practice

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Good! Really that's the best kind of prep

Which did you do?

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15. (Original post by CD223)
True! Did my last proper past paper for both exams today - just gonna do pilot papers from now on!

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Decent!! Which paper did you do today??

Spoiler:
Show

Again you're doing maths!!
hahahahaha
16. (Original post by lionelmessi19)
Decent!! Which paper did you do today??

Spoiler:
Show

Again you're doing maths!!
hahahahaha
June 2014 again haha!

Ah well I've done Physics and History too today so fairly balanced

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17. (Original post by CD223)
June 2014 again haha!

Ah well I've done Physics and History too today so fairly balanced

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What did you get in June 14 today? Gonna try beat it later hahaha
I assume you're quite excited for Friday lol
I'm doing starting june 13 now!
18. (Original post by lionelmessi19)
What did you get in June 14 today? Gonna try beat it later hahaha
I assume you're quite excited for Friday lol
I'm doing starting june 13 now!
Got 74 in C3 and 73 in C4 (but bear in mind that's a second attempt aha)

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19. (Original post by CD223)
Got 74 in C3 and 73 in C4 (but bear in mind that's a second attempt aha)

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Omfg!!! I'll take that back,, I won't even attempt to beat that ahahahahaha!!
20. (Original post by CD223)
Good! Really that's the best kind of prep

Which did you do?

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Well it was the 2009 one I think. There was a weird one where you has to find the volume of a solid using the Simpsons rule, will try and to C3 Jan 12 Jan 13 Jun 13 and Jun 14 tomorrow and Thursday as well as trying a fee more pilot questions . Are you just gonna be doing pilot questions now?

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