Edexcel A2 C3 Mathematics 12th June 2015 Watch

This discussion is closed.
fm81
Badges: 2
Rep:
?
#1401
Report 3 years ago
#1401
(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
0
laurenjjj
Badges: 1
Rep:
?
#1402
Report 3 years ago
#1402
(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!
0
Gilo98
Badges: 5
Rep:
?
#1403
Report 3 years ago
#1403
(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
0
Seventeen
Badges: 2
Rep:
?
#1404
Report 3 years ago
#1404
so basically Solomon papers are from A to L is it that the closer it is to L the harder it gets?
0
rache11ouise
Badges: 4
Rep:
?
#1405
Report 3 years ago
#1405
(Original post by laurenjjj)
https://07a69ccf283966549a9350d1a669...%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
Attached files
0
beckm
Badges: 0
Rep:
?
#1406
Report 3 years ago
#1406
so lnx differentiates to 1/x
does any lnx differentiate to 1/x as in ln2x, ln3x etc.?
0
sagar448
Badges: 2
Rep:
?
#1407
Report 3 years ago
#1407
(Original post by TeeEm)
year 2044
Can I know what question and past paper that is from please?
0
Gilo98
Badges: 5
Rep:
?
#1408
Report 3 years ago
#1408
(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
0
Gilo98
Badges: 5
Rep:
?
#1409
Report 3 years ago
#1409
(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
0
rache11ouise
Badges: 4
Rep:
?
#1410
Report 3 years ago
#1410
(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
0
beckm
Badges: 0
Rep:
?
#1411
Report 3 years ago
#1411
(Original post by Gilo98)
Yes. Apply the chain rule and you'll see why
but if its like 2lnx then its 2/x?
0
Gilo98
Badges: 5
Rep:
?
#1412
Report 3 years ago
#1412
(Original post by beckm)
but if its like 2lnx then its 2/x?
Yep
0
beckm
Badges: 0
Rep:
?
#1413
Report 3 years ago
#1413
(Original post by rache11ouise)
ln2x differentiates to 2/2x which simplifies to 1/x
right ok thank you
0
beckm
Badges: 0
Rep:
?
#1414
Report 3 years ago
#1414
(Original post by Gilo98)
Yep
fab thank you
0
physicsmaths
Badges: 18
Rep:
?
#1415
Report 3 years ago
#1415
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
0
physicsmaths
Badges: 18
Rep:
?
#1416
Report 3 years ago
#1416
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
0
Gilo98
Badges: 5
Rep:
?
#1417
Report 3 years ago
#1417
(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.
0
MariaAlenaT
Badges: 0
Rep:
?
#1418
Report 3 years ago
#1418
(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
0
TeeEm
Badges: 19
Rep:
?
#1419
Report 3 years ago
#1419
(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
0
rache11ouise
Badges: 4
Rep:
?
#1420
Report 3 years ago
#1420
look at solomon tiered papers they are set on difficultly, gold being the hardest

http://www.physicsandmathstutor.com/...e-silver-gold/
0
X
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Cranfield University
    Cranfield Forensic MSc Programme Open Day Postgraduate
    Thu, 25 Apr '19
  • University of the Arts London
    Open day: MA Footwear and MA Fashion Artefact Postgraduate
    Thu, 25 Apr '19
  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 27 Apr '19

Have you registered to vote?

Yes! (26)
50%
No - but I will (1)
1.92%
No - I don't want to (1)
1.92%
No - I can't vote (<18, not in UK, etc) (24)
46.15%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise