Edexcel A2 C4 Mathematics June 2015 - Official Thread

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Could someone help me with part (c) on this question?? Parts (a) and (b) were fine, but I just can't seem to get the integration right in part (c)

Which part are you struggling to integrate?

Reply 881

Jack_Linaker

Original post by theoeht

use x = (7100-8)/-9 and sub it into the expansion

That's what I thought, but according to the mark scheme x should equal 0.1

Reply 882

sj97

Original post by mar28

I think i need same, done all past papers from 2005-2014 including 13/14 reserves, done international jan14/15 and 2 solomon papers but today couldn't do todays paper at all :frown:

Bye University, C4 is going to be very hard too as recently Cores have been getting harder but other modules like S1,M1 and so on have been nicer(thats what people say anyway)

I know what you mean!! Practiced so much for C3 and ended up making a lot of silly mistakes, should be getting 44 raw marks (at the very least, maybe one or two marks higher). Will have to get 100 ums just to scrape a B overall :/ I do think that you'll do great though haha

Reply 883

theoeht

Original post by Jack_Linaker

That's what I thought, but according to the mark scheme x should equal 0.1

hmm, what else have you tried?

Reply 884

Jack_Linaker

Original post by theoeht

hmm, what else have you tried?

Absolutely nothing ahaha. My first thought was to cry, my second thought was to ask TSR, so here I am

Reply 885

theoeht

Original post by Jack_Linaker

That's what I thought, but according to the mark scheme x should equal 0.1

change 3rd root7100 to 3r root1000 times root7.1 then 7.1 = 8-9x etc etc

Reply 886

mar28

How much is 44 UMS? i don't understand how they convert raws to UMS, i didn't make silly mistakes it was only last question i read it as g of inverse rather than quotent rule other than that made no mistake just had no idea what to do, now concentrate on C4 and D2, fun fun.. I think i got 27 marks, really really bad :frown:

Reply 887

theoeht

Original post by theoeht

change 3rd root7100 to 3r root1000 times root7.1 then 7.1 = 8-9x etc etc

the 3rd root 1000 just becomes 10 and x = 0.1 and then times everything by this 10 at the end

Reply 888

Jack_Linaker

Original post by theoeht

change 3rd root7100 to 3r root1000 times root7.1 then 7.1 = 8-9x etc etc

That makes a lot of sense, cheers!

Original post by mar28

how much is 44 ums? I don't understand how they convert raws to ums, i didn't make silly mistakes it was only last question i read it as g of inverse rather than quotent rule other than that made no mistake just had no idea what to do, now concentrate on c4 and d2, fun fun.. I think i got 27 marks, really really bad :frown:

90ums = a*
80ums = a
70ums = b
60ums = c
50ums = d
40ums = e

Reply 891

theoeht

Original post by Jack_Linaker

That makes a lot of sense, cheers!

No problem, what past paper is it in?

(edited 8 years ago)

Reply 892

mar28

Original post by theoeht

90ums = a*
80ums = a
70ums = b
60ums = c
50ums = d
40ums = e

Thanks, but something has gone wrong on here was posting this on C3 thread :smile:

Reply 893

nbofni

Original post by theoeht

Which part are you struggling to integrate?

The 12sint^2 cost part.

I tried to use by parts for both parts of the integration. Is there a better way to do it that I'm not seeing? Maybe a bit of U-substitution?

Reply 894

theoeht

Original post by nbofni

The 12sint^2 cost part.

I tried to use by parts for both parts of the integration. Is there a better way to do it that I'm not seeing? Maybe a bit of U-substitution?

4(sin t)^3

Reply 895

Emmi12345

This thread has exploded since the C3 exam.

Reply 896

theoeht

Original post by nbofni

The 12sint^2 cost part.

I tried to use by parts for both parts of the integration. Is there a better way to do it that I'm not seeing? Maybe a bit of U-substitution?

It's integration by recognition, sometimes the simplest ones look the hardest!

imagine you had to differentiate (sinx)^3, you get 3sinx^2 cosx as you bring the power down and times by the derivative of what's inside the brackets