Edexcel C3,C4 June 2013 Thread

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Reply 5140

na5h

Original post by caroliar

ehh check if they skew or not

AWw. Thankx :smile:

Reply 5141

posthumus

Original post by kronca

why do you not divide the fractions? to get a quotient? the markscheme just straight goes into it

dont you divide it when the degrees are the same?

Here it is not so obvious that the fraction is "top heavy"... but they have already shown you that it can be divided/simplified with that A

Reply 5142

kronca

Original post by posthumus

Here it is not so obvious that the fraction is "top heavy"... but they have already shown you that it can be divided/simplified with that A

I see how they got the a = 2

but why is there a(x-1)(x+2) and the 2(x^2)+5x-10 shouldnt it be the quotient of the division where you get the A

Reply 5143

posthumus

Original post by kronca

I see how they got the a = 2

but why is there a(x-1)(x+2) and the 2(x^2)+5x-10 shouldnt it be the quotient of the division where you get the A

I'm not sure what you quite mean but I'll just show you how I've gone about it & you can tell me if the mark scheme disagrees...

................. 2
x^2 + x - 2 | 2x^2 + x - 2
...................2x^2 + 2x -4
.....................0 -x + 2

(its about time I learnt latex :tongue:

)

So now I have 2 - x + 2 / x^2 + x - 2

leave the 2 to one side now do partial fractions with B & C

-x + 2 / (x-1)(x+2) = B + C

-x + 2 = B(x+2) + C(x-1)

sub in 1

B=1/3

sub in -2

C=-4/3

Therefore it's ...

2 + 1 / 3(x-1) + 4 / 3(x+2)

???

Reply 5144

Charlz94

Hey. Could anyone post like an exhaustive intergration list. As in all the techniques (short explanation with not much detail)

As in 1) By parts (use formula booklet) 2) Substitution (u=...)

Reply 5145

ColdHugs22

really panic about the paper....didnt get a chance to revise as much as i wanted :mad:

best of luck to everyone taking the paper.....lets hope its easy :smile:

Reply 5146

Charlz94

Original post by ColdHugs22

really panic about the paper....didnt get a chance to revise as much as i wanted :mad:

best of luck to everyone taking the paper.....lets hope its easy :smile:

**** that, lets hope its hard as **** so I still get a decent grade with my low marks :L

Reply 5147

PoorLoser

Original post by ColdHugs22

really panic about the paper....didnt get a chance to revise as much as i wanted :mad:

best of luck to everyone taking the paper.....lets hope its easy :smile:

i feel the same, i just hope the integration is easy :/

good luck!!

Reply 5148

caroliar

Original post by Charlz94

Hey. Could anyone post like an exhaustive intergration list. As in all the techniques (short explanation with not much detail)

As in 1) By parts (use formula booklet) 2) Substitution (u=...)

edexcel texbook-end page of every chapter.use it as a summary... on the other hand i need a formula sheet to see what we're given

Reply 5149

caroliar

If its your last exam, ENJOY IT, I will. Good luck geniuses :smile:

Reply 5150

Aikta_S

Just accepts that I probably won't get into uni...I don't know anything! :'(

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Reply 5151

OneMorePanda

Don't forget to revise integration by reduction, guys! That hasn't come up in a while.

Reply 5152

May-o2q

Good luck everyone... Im getting so nervous... Hope we get a beautiful paper this time.....

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Reply 5153

May-o2q

Original post by OneMorePanda

Don't forget to revise integration by reduction, guys! That hasn't come up in a while.

Aww... Could you please attach an example?? Maybe??

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Reply 5154

MathsNerd1

Original post by May-o2q

Aww... Could you please attach an example?? Maybe??

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I think they meant recognition?

Reply 5155

SortYourLife

I'm awake.... I'm ready. I think. Maybe.

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Reply 5156

explicit4u

Original post by Aikta_S

Just accepts that I probably won't get into uni...I don't know anything! :'(

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Feeling the same :frown:

Good luck to everyone!

Reply 5157

Saifstudioz

I really hope it's an easy paper :redface:

Good luck everyone
Hope y'all ace it :smile:

sooo scared.

goood luck everyoneeeeee !!! IMPORTANT THING IS TO STAY CALM AND NOT RUSH AND DEFINITELY DONT PANIC, YOU SEE A QUESTION YOU DON'T LIKEEE, MOVE ON AND COME BACK TO IT LATERRRR !!!! AND PLEASEEEE MAKE SURE YOU DONT GET COCKY WITH CALCULATIONS SO YOU DONT MAKE STUPID MISTAKES