# Edexcel A2 C3 Mathematics 12th June 2015Watch

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#261
Got an A in my mock
0
4 years ago
#262
(Original post by Kill3er)
Got an A in my mock
Well done - keep it up
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4 years ago
#263
Has anyone got any idea how to do question 4 onwards?? I can differentiate but I just don't know how to find the gradient/equation etc

Thank you!!

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0
4 years ago
#264
(Original post by strawberrysnow)
Has anyone got any idea how to do question 4 onwards?? I can differentiate but I just don't know how to find the gradient/equation etc

Thank you!!

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have u seen y-y1=m(x-x1) where x1,y1 are points that lie on that line.
Also do you know what the 'normal' is.

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0
4 years ago
#265
(Original post by physicsmaths)
have u seen y-y1=m(x-x1) where x1,y1 are points that lie on that line.
Also do you know what the 'normal' is.

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The normal is the negative reciprocal right? And thanks for the equation - forgot about that!

My biggest problem is not knowing hot to find out the gradient though?? I differentiated it but I just don't know what to do next???

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#266
(Original post by strawberrysnow)
The normal is the negative reciprocal right? And thanks for the equation - forgot about that!

My biggest problem is not knowing hot to find out the gradient though?? I differentiated it but I just don't know what to do next???

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They give you (1,0).
Differentiate and sub x=1 to get the gradiant of the tangent. Negative reciprocal to get the gradiant of the normal.
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4 years ago
#267
Hiya,

I tried to differentiate this using the chain rule but my answer isn't right?? I don't understand what I did wrong?

Thanks

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4 years ago
#268
(Original post by strawberrysnow)
Hiya,

I tried to differentiate this using the chain rule but my answer isn't right?? I don't understand what I did wrong?

Thanks

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Differentiate 1/x then multiply the entire equation by the differential.
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4 years ago
#269
(Original post by Abel Demoz)
Differentiate 1/x then multiply the entire equation by the differential.
Thank you
0
4 years ago
#270
help im always confused

in graph transformations is it always stretch before shift?

example 1. y= 2f(x)-4 therefore stretch by 2 and shift 4down?

example 2. y= f(2x-4) halve by 2 and shift right by 4 units?

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4 years ago
#271
(Original post by dee1995)
help im always confused

in graph transformations is it always stretch before shift?

example 1. y= 2f(x)-4 therefore stretch by 2 and shift 4down?

example 2. y= f(2x-4) halve by 2 and shift right by 4 units?

Example 1: yes

Example 2 will not happen in Edexcel C3 - it is ruled out in the specification:
"The graph of y = f(ax + b) will not be required."
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4 years ago
#272
(Original post by tiny hobbit)
Example 1: yes

Example 2 will not happen in Edexcel C3 - it is ruled out in the specification:
"The graph of y = f(ax + b) will not be required."
How do you know it is ruled out in the spec where does it say this
thanks
0
4 years ago
#273
(Original post by dee1995)
How do you know it is ruled out in the spec where does it say this
thanks
In the specification.

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0
4 years ago
#274
(Original post by dee1995)
How do you know it is ruled out in the spec where does it say this
thanks
The bit in quotes was copied from the spec.
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4 years ago
#275
I have been taught vector at school, but I can't remember anything What's the best website/book to revise vectors from?
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4 years ago
#276
(Original post by games211)
I have been taught vector at school, but I can't remember anything What's the best website/book to revise vectors from?
Ive been going through vectors today as well they're not nice :'(

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#277
Time to start Solomon papers.
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4 years ago
#278
(Original post by Kill3er)
Time to start Solomon papers.
I take it you've done all of the Edexcel papers that are available, including the one that was withdrawn in 2013, the R papers from 2013 and 2014 and the IAL papers?
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4 years ago
#279
1. how to become an expert at trig? particularly trig identities?

2. when roughly should you finish doing the edexcel past papers and move onto the solomon papers?

cheers
0
4 years ago
#280
(Original post by dee1995)
1. how to become an expert at trig? particularly trig identities?

2. when roughly should you finish doing the edexcel past papers and move onto the solomon papers?

cheers
For no. 1 its just practice, if things are not working out, change everything to sin and cos.
No. 2. When you have done all the edexcel papers.

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