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# Edexcel A2 C4 Mathematics June 2016 - Official Thread watch

1. (Original post by Anon_98)
Thank you again, lots! Sorry, Prsom. (':
You're welcome.
2. (Original post by XxKingSniprxX)
I agree, especially when you lay your work out ever so neatly and
the entire method etc is correct until you realise that your earlier apart
was supposed to be '+' or ' - '.
Guess that's one of the benefits of never having neat work.
3. PhysicsMathsTut what would 65/75 be for the mock paper (c4) on your website

https://a086a5a2f39bda93734c56a63fab...%20Edexcel.pdf

4. When converting trig parametric equations to cartesian, would you get marks for comparing sides of a triangle instead of using the identity? Because the mark scheme I'm reading only uses the identity.
5. (Original post by NotNotBatman)
When converting trig parametric equations to cartesian, would you get marks for comparing sides of a triangle instead of using the identity? Because the mark scheme I'm reading only uses the identity.
Yeah, you would. That's perfectly fine.
6. I've done my first C4 paper and got 66/75; I should be getting into the 70's in no time considering my first c3 was quite a bit lower, but now I'm averaging 71/75.

And I still haven't looked at the binomial expansion chapter, just went off the formula (got it wrong though :P )
7. (Original post by NotNotBatman)
I've done my first C4 paper and got 66/75; I should be getting into the 70's in no time considering my first c3 was quite a bit lower, but now I'm averaging 71/75.

And I still haven't looked at the binomial expansion chapter, just went off the formula (got it wrong though :P )
Not bad at all, well done!
8. (Original post by Zacken)
Not bad at all, well done!
Thanks!
9. Can anyone help me with the top question from the review exercise in the c4 book
Thanks
Attached Images

10. (Original post by boyyo)
Can anyone help me with the top question from the review exercise in the c4 book
Thanks
What have you tried?
11. (Original post by Zacken)
What have you tried?
well i started with this and then I know that OP is 0A+ 0.25(AB),
but thats where Im confused because the ratio is AP=3BP and when I do a quater of AB i get fraction asnwers
12. I meant to add this picture
Attached Images

13. (Original post by boyyo)
well i started with this and then I know that OP is 0A+ 0.25(AB),
but thats where Im confused because the ratio is AP=3BP and when I do a quater of AB i get fraction asnwers
Call P (xi + yj + zk) then compute AP and 3BP then equate i,j and k components.
14. (Original post by Zacken)
Call P (xi + yj + zk) then compute AP and 3BP then equate i,j and k components.
Ok, but does it matter how I draw the diagram, as the solution bank drew it differently to mine?
15. (Original post by boyyo)
Ok, but does it matter how I draw the diagram, as the solution bank drew it differently to mine?
At a glance, your diagram seems fine - although a bit weird because AP should be the smaller length, but that doesn't really matter.
16. (Original post by boyyo)
Can anyone help me with the top question from the review exercise in the c4 book
Thanks
(Original post by Zacken)
At a glance, your diagram seems fine - although a bit weird because AP should be the smaller length, but that doesn't really matter.
The question says that P is on AB produced. This means that you have to extend the line AB beyond B and P is on the new bit of line.
17. Im resitting C1 and C2, I'm hoping to get around 90% in them this year, C3 is ok, but I'm struggling with C4 vectors and D1 that we haven't finished yet.
18. (Original post by Zacken)
At a glance, your diagram seems fine - although a bit weird because AP should be the smaller length, but that doesn't really matter.
(Original post by tiny hobbit)
The question says that P is on AB produced. This means that you have to extend the line AB beyond B and P is on the new bit of line.
Oh yh ok I see, thanks guys
19. hey does anyone have a link to any good vectors resources/difficult vector questions?
20. (Original post by joodaa)
hey does anyone have a link to any good vectors resources/difficult vector questions?
Phy&Math

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