Edexcel A2 C3 Mathematics 12th June 2015 Watch

This discussion is closed.
TeeEm
Badges: 19
Rep:
?
#1001
Report 3 years ago
#1001
http://www.thestudentroom.co.uk/show....php?t=3361867
0
Medicjug
Badges: 2
Rep:
?
#1002
Report 3 years ago
#1002
Hey teem,

I have got down to paper O. Just wanted to ask if papers after s start to get really hard.


Posted from TSR Mobile
0
TeeEm
Badges: 19
Rep:
?
#1003
Report 3 years ago
#1003
(Original post by Medicjug)
Hey teem,

I have got down to paper O. Just wanted to ask if papers after s start to get really hard.


Posted from TSR Mobile
S and T you miss

then from U they get even harder
0
ridirahman
Badges: 2
Rep:
?
#1004
Report 3 years ago
#1004
The function g is defined by g:x^2 – 4x + 11, x<=0. (b) Find the range of g.

As it says x<=0, would you substitute 0 into g which gives you 11 and that's the range?
Or do you complete the square of g and then find the range?

I always get confused don't know whether to substitute the range of x they give you to find the range of y or to complete the square/ factorise and then to find the range by drawing the diagram?
0
s234590
Badges: 3
Rep:
?
#1005
Report 3 years ago
#1005
im so confused with domain and range questions please help
0
username1441766
Badges: 1
Rep:
?
#1006
Report 3 years ago
#1006
Do the Solomon papers get harder as you go through them or do they all have much the same difficulty?
0
Artfanatic
Badges: 12
Rep:
?
#1007
Report 3 years ago
#1007
(Original post by ridirahman)
The function g is defined by g:x^2 – 4x + 11, x<=0. (b) Find the range of g.

As it says x<=0, would you substitute 0 into g which gives you 11 and that's the range?
Or do you complete the square of g and then find the range?

I always get confused don't know whether to substitute the range of x they give you to find the range of y or to complete the square/ factorise and then to find the range by drawing the diagram?
I think it always helps to draw it if you can. I am pretty sure you just complete the square then you know the min point is (2,7) on the graph so then it depends on the domain given, no?
0
lam12
Badges: 2
Rep:
?
#1008
Report 3 years ago
#1008
(Original post by Artfanatic)
I think it always helps to draw it if you can. I am pretty sure you just complete the square then you know the min point is (2,7) on the graph so then it depends on the domain given, no?
Woah what? Do we complete the square to help us?


Posted from TSR Mobile
0
MasonPye
Badges: 1
Rep:
?
#1009
Report 3 years ago
#1009
Are these IYGB papers more difficult than a standard paper?
0
ridirahman
Badges: 2
Rep:
?
#1010
Report 3 years ago
#1010
(Original post by Artfanatic)
I think it always helps to draw it if you can. I am pretty sure you just complete the square then you know the min point is (2,7) on the graph so then it depends on the domain given, no?
The answer is x>=7
So every time you get a question like this you complete the square?
and how does it depend on the domain?
0
ridirahman
Badges: 2
Rep:
?
#1011
Report 3 years ago
#1011
(Original post by lam12)
Woah what? Do we complete the square to help us?


Posted from TSR Mobile
yeah I think so.. to find the range
I hate these questions :/ they are so confusing
0
lam12
Badges: 2
Rep:
?
#1012
Report 3 years ago
#1012
(Original post by ridirahman)
yeah I think so.. to find the range
I hate these questions :/ they are so confusing
Whattttt haha I've never done that, I need to learn this


Posted from TSR Mobile
0
ridirahman
Badges: 2
Rep:
?
#1013
Report 3 years ago
#1013
(Original post by lam12)
Whattttt haha I've never done that, I need to learn this


Posted from TSR Mobile
So how would you do the question? Is there another way or something?
0
samb1234
Badges: 13
Rep:
?
#1014
Report 3 years ago
#1014
(Original post by ridirahman)
So how would you do the question? Is there another way or something?
You could set the differential equal to 0 solve for x then plug that into the original equation

Posted from TSR Mobile
0
ridirahman
Badges: 2
Rep:
?
#1015
Report 3 years ago
#1015
(Original post by samb1234)
You could set the differential equal to 0 solve for x then plug that into the original equation

Posted from TSR Mobile
Ohh yeah okay thanks.

If you don't mind, can you explain how you would know whether to put <= or >= when finding the range/domain?
0
samb1234
Badges: 13
Rep:
?
#1016
Report 3 years ago
#1016
(Original post by ridirahman)
Ohh yeah okay thanks.

If you don't mind, can you explain how you would know whether to put <= or >= when finding the range/domain?
Either you can find d^2y/dX^2 to determine nature of the point or if there is just one turning point you could just plug one other number from the range/domain into the original equation and see if it gives a greater or lower answer

Posted from TSR Mobile
0
Nurishment
Badges: 2
Rep:
?
#1017
Report 3 years ago
#1017
(Original post by ridirahman)
The function g is defined by g:x^2 – 4x + 11, x<=0. (b) Find the range of g.

As it says x<=0, would you substitute 0 into g which gives you 11 and that's the range?
Or do you complete the square of g and then find the range?

I always get confused don't know whether to substitute the range of x they give you to find the range of y or to complete the square/ factorise and then to find the range by drawing the diagram?
Wouldn't the range be g;x >= 11?
Completing the square just finds the minimum point at (2,7) in which the value of x is greater than 0 so the range wouldn't start from there?
0
samb1234
Badges: 13
Rep:
?
#1018
Report 3 years ago
#1018
(Original post by Nurishment)
Wouldn't the range be g;x >= 11?
Completing the square just finds the minimum point at (2,7) in which the value of x is greater than 0 so the range wouldn't start from there?
The range of a function describes what value f(x) can take. The minimum value of f(x) is 7 so the range is f(x)>=7

Posted from TSR Mobile
0
tajanamckenzie
Badges: 0
Rep:
?
#1019
Report 3 years ago
#1019
someone help! ok so with the Rcos(x+a) for example and say you find out a and cos then it says work out the minimum value and the smallest possible value of x? Also for when it asks for the maximum and greatest possible value???? and what about for sine graph??? please help
0
Nurishment
Badges: 2
Rep:
?
#1020
Report 3 years ago
#1020
(Original post by Nurishment)
Wouldn't the range be g;x >= 11?
Completing the square just finds the minimum point at (2,7) in which the value of x is greater than 0 so the range wouldn't start from there?
(Original post by samb1234)
The range of a function describes what value f(x) can take. The minimum value of f(x) is 7 so the range is f(x)>=7

Posted from TSR Mobile
But the domain is less than or equal to 0, therefore f(x) can never take the value of 7 because the only time it's 7 is when x = 2. Is there a mark scheme or something?
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! (377)
37.44%
No - but I will (77)
7.65%
No - I don't want to (71)
7.05%
No - I can't vote (<18, not in UK, etc) (482)
47.86%

Watched Threads

View All