Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

Year 12s: what will be the first way you research your future options? >>

This discussion is now closed.

Check out other Related discussions

Edexcel A2 C3 Mathematics 12th June 2015

Scroll to see replies

Original post by adorablegirl1202

June 2014 4c???

Find the gradient of the line using change in y/change in x which is 12/6. This means the gradient and thus a is 2. Now sub in given x and y values to find b.

Posted from TSR Mobile

Original post by dnpnstn

you know g(x)=ln2x, so for g(x^2), it must be ln2x^2. You do the same with g(x^3)

This gives you:
ln2x + ln2x^2 + ln2x^3 = 6
You can then split this up using rules of logs
(lnx +ln2) + (lnx^2 + ln2) + (lnx^3 + ln2) =6
Bring down the powers of x and simplify, giving
6lnx + 3ln2 = 6
Then just solve for x

Thank you so much! I wasnt sure of the last two steps!

Original post by adorablegirl1202

Thanks!!! Do i just take the mod value to be positive? i mean i did origianally but then i thought should i have done it negative as well?

mod value is always positive :smile:

:smile:

so basically Solomon papers are from A to L is it that the closer it is to L the harder it gets?

Original post by laurenjjj

https://07a69ccf283966549a9350d1a66951a7bc96e2dc.googledrive.com/host/0B1ZiqBksUHNYZ0JQM1NRcmdHdXM/June%202014%20(R)%20QP%20-%20C3%20Edexcel.pdf Could somebody please help with 6c, I just don't understand any of it :-(

g(x)=ln2(x)
g(x)+g(x^2)+g(x^3)=6
when x=x ---> g(x)=ln2(x) ---> expand the brackets ---> ln2x
when x=x^2 ---> g(x^2)=ln2(x^2) ---> expand the brackets ---> ln2x^2
when x=x^3 ---> g(x^3)=ln2(x^3) ---> expand the brackets ---> ln2x^3

ln2x + ln2x^2 + ln2x^3 = 6
ln((2x) x (2x^2) x (2x^3)) = 6
ln(8x^6) = 6
8x^6 = e^6
x^6 = (e^6)/8
x= the sixth root of e^6/8

made it as clear as i can, hope this helps

IMG_0014.JPG329.1KB

so lnx differentiates to 1/x
does any lnx differentiate to 1/x as in ln2x, ln3x etc.?

Original post by TeeEm

year 2044

Can I know what question and past paper that is from please?

Original post by beckm

so lnx differentiates to 1/x
does any lnx differentiate to 1/x as in ln2x, ln3x etc.?

Yes. Apply the chain rule and you'll see why

Original post by Seventeen

so basically Solomon papers are from A to L is it that the closer it is to L the harder it gets?

don't think so, pretty sure they are roughly all as hard as each other

Original post by beckm

so lnx differentiates to 1/x
does any lnx differentiate to 1/x as in ln2x, ln3x etc.?

ln2x differentiates to 2/2x which simplifies to 1/x

Original post by Gilo98

Yes. Apply the chain rule and you'll see why

but if its like 2lnx then its 2/x?

Original post by beckm

but if its like 2lnx then its 2/x?

Yep

Original post by rache11ouise

ln2x differentiates to 2/2x which simplifies to 1/x

right ok thank you

Original post by Gilo98

Yep

fab thank you

username1162972

Anyone? Hardest C3 paper (not including June 13) dont have much time to do alot of papers. Can only do 1/2

Posted from TSR Mobile

username1162972

Basically ln(u) wher u is function of x 1/u du/dx
Apply that everywhere. Simple application of chain rule.

Posted from TSR Mobile

Original post by physicsmaths

Anyone? Hardest C3 paper (not including June 13) dont have much time to do alot of papers. Can only do 1/2

Posted from TSR Mobile

June 2014 had slightly low boundaries. Papers have been fairly consistent otherwise. Maybe look at recent IAL papers.

Original post by physicsmaths

Anyone? Hardest C3 paper (not including June 13) dont have much time to do alot of papers. Can only do 1/2

Posted from TSR Mobile

^^ what he said! ... Was just going to ask this

Original post by sagar448

Can I know what question and past paper that is from please?

year?
I just wrote it a few hours ago

look at solomon tiered papers they are set on difficultly, gold being the hardest

http://www.physicsandmathstutor.com/a-level-maths-papers/c3-edexcel-bronze-silver-gold/

(edited 8 years ago)

Related discussions

Latest

Trending

Trending

Articles for you

Edexcel A-Level Economics Paper 1 - Unofficial Mark Scheme - 18 May 2023

Students react after A-level Economics Paper 2 on 22 May 2023

Students react after A-level Economics Paper 2 on 22 May 2023

Students react after A-level Maths Paper 3 on 20 June

Students react after A-level Maths Paper 3 on 20 June

Students react to A-level Chemistry Paper 2 on 19 June 2023

Students react to A-level Chemistry Paper 2 on 19 June 2023