# Edexcel A2 C3 Mathematics 12th June 2015Watch

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3 years ago
#1001
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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.

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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.

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S and T you miss

then from U they get even harder
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3 years ago
#1004
The function g is defined by g:x^2 â€“ 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?
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3 years ago
#1005
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3 years ago
#1006
Do the Solomon papers get harder as you go through them or do they all have much the same difficulty?
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3 years ago
#1007
(Original post by ridirahman)
The function g is defined by g:x^2 â€“ 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?
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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?

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3 years ago
#1009
Are these IYGB papers more difficult than a standard paper?
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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?
So every time you get a question like this you complete the square?
and how does it depend on the domain?
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3 years ago
#1011
(Original post by lam12)
Woah what? Do we complete the square to help us?

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yeah I think so.. to find the range
I hate these questions :/ they are so confusing
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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

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3 years ago
#1013
(Original post by lam12)
Whattttt haha I've never done that, I need to learn this

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So how would you do the question? Is there another way or something?
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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

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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

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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?
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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

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3 years ago
#1017
(Original post by ridirahman)
The function g is defined by g:x^2 â€“ 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?
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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

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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
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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

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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?
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