Edexcel C2 20th May 2015 Official Thread

Scroll to see replies

Reply 2200

VyteJan

Original post by CÜntington III

Theyre a bunch of useless ******s

innit, thankkkk youuu :angry:

Reply 2201

CÜntington III

Original post by HarryDESMOND

arsey fam where u @

useless wan ker

Reply 2202

Pikki1234

How many marks would I lose if I wrote 4cos^2x-4cosx =k instead of factorising it?

Posted from TSR Mobile

Reply 2203

Ukranium

Original post by Mattematics

Got the same as you for all of them except the factorising question, which I'm pretty sure I got wrong.

4cos^2x - cosx -3 = 0

(4cosx +3 )(cosx - 1)

x = cos^-1 ( -3/4)
x = cos^-1(1)

you only put the solutions for x=cos^-1(-3/4)

what about the solutions of cos^-1(1)???

Reply 2204

HarryDESMOND

Original post by jf1994

You should write questions for edexcel papers, completely undecipherable and unintelligible.

You're just mad because you've got parkinsons and can;'t ****

Reply 2205

TeeEm

please vote on the paper
http://www.thestudentroom.co.uk/showthread.php?t=3343941

Reply 2206

TheAstrocist

Original post by frances98

194???

Maybe, I can't remember exactly what he said

Reply 2207

HarryDESMOND

http://strawpoll.me/4406285/r sound kid

want to link

162??????????

I messed up real bad :frown:

Trig threw me completley, couldn't even do the last two questions :frown:

Reply 2210

prepdream

Original post by hasnain123

i got (3x-12)(x+4) why is that wrong ? someone help meh pls

Is that your full factorisation?
If so, you probably lack (2X+1).
If not, then you will lose 1 mark for not fully factories as you have to put 3 out of the bracket :smile:

Reply 2211

Deemajek

Has any one found the mark scheme the algebraic fraction finding B-A=45
what does everyone think about how many marks would be allocated for an A?

Reply 2212

Hornstar123

Original post by starkers1997

That was ******* difficult! I just couldn't get my head around the sequences question! I couldn't find r! First 4 questions were ok, then the rest were as hard as a brick wall! Expecting low grade boundaries....

Found it a piece of piss tbh

Reply 2213

babyetu

Q1) yes
Q2) yes
Q3) I screwed up polynomial division and subbed in x=-1/2 and ended up with B=1/2A, forgot to carry on from there lol
Q4) yes
Q5) Second part, got a quadratic, but messed that up, so maybe 4/9 for that Q
Q6) yes, unsure though because I got 162 as the shaded area. Integration gets you the area under the curve, and the shaded area was above the curve so I did []0,4 and added it to the integration of []9,4
Q7) yes but got N=11
Q8) yes
Q9) When I differentiated, I stupidly forgot to put the minus for 300pir-2 so will only get about 2 method marks for that

Reply 2214

kinkiro

Guys if anyone finds an unofficial markscheme like the one for c1 could you link it

Reply 2215

Notallwrong

This is not a markscheme this is just what my answers were. Minimal hate if not correct please

Reply 2216

Mattematics

Original post by Ukranium

4cos^2x - cosx -3 = 0

(4cosx +3 )(cosx - 1)

x = cos^-1 ( -3/4)
x = cos^-1(1)

you only put the solutions for x=cos^-1(-3/4)

what about the solutions of cos^-1(1)???

Solutions for cos(1) are 0 and 360. The range said less than 360, so it's just 0.