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# Edexcel C3,C4 June 2013 Thread watch

1. (Original post by JOR2010)
Can you do vectors too?!
It can, though it's pretty much useless in C4 where you have to deal with vector equations and unknowns.
2. if i got AB= (4i,6i,2k)
and its vector equation to be r= (1i,2j,3k) + x(4i,6j,2k)
do i have to simplify it to r= (1i,2j,3k) + x(2i,3j,1k)??
3. (Original post by usycool1)
No, it's not a mistake

You can write it as:

P =

is just a constant, so let it equal "k" (although it would have been better to let it equal another letter).

So:

P =
Oh yeah! thanks
4. (Original post by orange94)
It's only numerical integration with those Casio silver not algebraic will only be useful I assume with limits with the integral!

If you have algebraic calculator that's not allowed in exam only numerical!

Posted from TSR Mobile
Even without limits you can just make up your own limits, put them into the calculator, then put them into your integral and see if the answers come out the same.

Or with a graphical one you can plot the graph of your answer, then plot the graph of the integral of the question and see if they're the same.
5. Hi,
Guys
could you help solve this integral. I need someone to guide me through it.

Many thanks
Attached Images

6. Vector Q:

A(-1,5,7) , B(13,19,-5). C divides AB in the ratio 1:5. Find C.

The thing I don't understand is why C=1/6(5A + B)
7. (Original post by RainieXD)
Ahh thanks ^^
I'll try my best!
It's just really hard to focus on C4 when I have 3 other exams next week to revise for
I'm sure you'll do well too!
thank you! I know the feeling had one today, C4 tomorrow and final one on wednesday so revision and time is tight at the moment :/
8. (Original post by TDL)
if you have one of those calculators that can integrate, you can check your answers for partial fractions, all the integration questions, and some of the vector questions as well as SOME differentiation questions.

If you don't, then you can't really.
How do you check partial fractions and vectors? I only know how to get integration!

(Original post by Knoyle quiah)
can check EVERYTHING with the silver casio fx 991ES plus, best calculator
I have this calculator, in what ways can you check everything that isn't integration!?
9. (Original post by fishnets)
Hi,
Guys
could you help solve this integral. I need someone to guide me through it.

Many thanks

Integration by substitution
10. (Original post by otrivine)
Differentiate it!
11. (Original post by kinoko)
if i got AB= (4i,6i,2k)
and its vector equation to be r= (1i,2j,3k) + x(4i,6j,2k)
do i have to simplify it to r= (1i,2j,3k) + x(2i,3j,1k)??
nope.
12. (Original post by fishnets)
Hi,
Guys
could you help solve this integral. I need someone to guide me through it.

Many thanks

Posted from TSR Mobile
13. (Original post by fishnets)
Hi,
Guys
could you help solve this integral. I need someone to guide me through it.

Many thanks
u=(x-1)0.5?

Vector Q:

A(-1,5,7) , B(13,19,-5). C divides AB in the ratio 1:5. Find C.

The thing I don't understand is why C=1/6(5A + B)

15. Guys, I need some advice. Basically, I'm really struggling but I need 75 for an A.

I literally know next to nothing, any advice on what to do?

I'm doing past papers and getting low marks.
16. (Original post by Knoyle quiah)
can check EVERYTHING with the silver casio fx 991ES plus, best calculator
not implicit differentiation
17. (Original post by fishnets)
Hi,
Guys
could you help solve this integral. I need someone to guide me through it.

Many thanks
By substitution

Let u =
18. (Original post by fayled)
u=(x-1)0.5?

Yeah.
19. (Original post by justinawe)

thank you!
20. (Original post by yaboy)
not implicit differentiation

Lol I wasn't being serious, there are many things you cant check, but one thing you CAN check is implicit differentiation, you can do this by checking each part of the equation differentiated rather than trying to put the whole thing into calculator which has two diff variables

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