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Edexcel A2 C3 Mathematics 12th June 2015

Reply 340

TheGemini

10

Help on Q 31
I got 1/4 on that question :| ImageUploadedByStudent Room1426426892.191681.jpg

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Reply 341

lam12

2

Original post by zed963

The domain of the original is the range of the inverse and vice versa.

The second thing is that when it comes to fractions, X cannot equal a value which causes the denominator to =0

In terms of e^x graph, the domain is XER and the range is y>0

There will be good videos on YouTube which explain it perfectly.

Also, try to give us a question that you're stuck with so we can discuss it.

I now have a question. So for January 2012 c3, I got question 7 part c I think. The one where it's working out the domain of the inverse. I understand this is the range for f(x) but I had x>1 and not x>0 so I'm just confused now haha

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Reply 342

zed963

16

Original post by lam12

I now have a question. So for January 2012 c3, I got question 7 part c I think. The one where it's working out the domain of the inverse. I understand this is the range for f(x) but I had x>1 and not x>0 so I'm just confused now haha

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Try drawing the graph of f^-1(x)

The denominator of the function cannot equal 0. Therefore any value greater than 0 is fine.

You knew that the denominator had to be greater than 1 but what you need to know is that it can also equal 1.

The number that it cannot equal is 0. Hence x>0

Have a look at this, http://www.examsolutions.net/a-level-maths-papers/worked-solution/worked-solution.php?paper_id=30&solution=7.3

It provides a graphical perspective.

(edited 9 years ago)

Reply 343

games211

16

Original post by TheGemini

Help on Q 31
I got 1/4 on that question :| ImageUploadedByStudent Room1426426892.191681.jpg

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what book is that?

Reply 344

Shakz

20

Original post by Paras Agarwal

well major major respect to you for your mock score! i suggest you give edexcel june 13 a try . #HARDESTPAPEROFALLTIME

are u on about paper june 13 o1r? if so, that is tuff! i managed to scrape an A though haha....

Reply 345

l1lvink

11

How do you remember which method of integration to use for different types of questions?

Reply 346

BBeyond

15

Original post by l1lvink

How do you remember which method of integration to use for different types of questions?

Chain rule = function within a function e.g. (x+2)^4
Product rule = function x function e.g (x+2)(x+7)^4
Quotient rule = function/function e.g. (x+2)/(x+8)

Reply 347

l1lvink

11

Original post by BBeyond

Chain rule = function within a function e.g. (x+2)^4
Product rule = function x function e.g (x+2)(x+7)^4
Quotient rule = function/function e.g. (x+2)/(x+8)

Thats differentiation, I'm on about parts/chain/substitution...

Reply 348

BBeyond

15

Original post by l1lvink

Thats differentiation, I'm on about parts/chain/substitution...

**** sorry aha assumed you meant diff as it was c3 thread my bad

Reply 349

l1lvink

11

Original post by BBeyond

**** sorry aha assumed you meant diff as it was c3 thread my bad

Ah, I've noticed my mistake too--I assumed this was AQA (my board), so perhaps you guys don't do integration in C3

Reply 350

BBeyond

15

Original post by l1lvink

Ah, I've noticed my mistake too--I assumed this was AQA (my board), so perhaps you guys don't do integration in C3

Nah integration is in c4 on edexcel :tongue:

Reply 351

Emma!95

Hey guys,

I wanted to ask, when you have to find X2, X3, ... in the iterative formula, do the answers have to always be in radians? :h:

Reply 352

Krollo

17

Original post by Emma!95

Hey guys,

I wanted to ask, when you have to find X2, X3, ... in the iterative formula, do the answers have to always be in radians? :h:

I would assume so unless otherwise specified.

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Reply 353

Ripper Phoenix

17

Original post by Emma!95

Hey guys,

I wanted to ask, when you have to find X2, X3, ... in the iterative formula, do the answers have to always be in radians? :h:

if you are working with sin or cos i.e if you see sin or cos in the question or the range given is in terms of pi we always use RADIANS. otherwise if no sin or cos present and the range is in degrees then we work in normal degrees :smile:

Reply 354

Emma!95

Original post by Ripper Phoenix

if you are working with sin or cos i.e if you see sin or cos in the question or the range given is in terms of pi we always use RADIANS. otherwise if no sin or cos present and the range is in degrees then we work in normal degrees :smile:

Thank you!! That actually makes sense!! :biggrin:

Reply 355

Krollo

17

Original post by Emma!95

Thank you!! That actually makes sense!! :biggrin:

I should point out -occasionally, e.g. on last year's paper, there was a question on iteration where degrees/radians was not specified. I believe the 'default' from C3 onwards in radians.

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Reply 356

Ripper Phoenix

17

Original post by Krollo

I should point out -occasionally, e.g. on last year's paper, there was a question on iteration where degrees/radians was not specified. I believe the 'default' from C3 onwards in radians.

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you can but thats wrong id say. You only use radians when you have a sin or cosine in the question, we have been taught this thats why i know haha

Reply 357

Emma!95

Original post by Krollo

I should point out -occasionally, e.g. on last year's paper, there was a question on iteration where degrees/radians was not specified. I believe the 'default' from C3 onwards in radians.

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oh okay I would defo watch out, Thank you for letting me know! :smile:

Reply 358

Ripper Phoenix

17

Original post by Emma!95

Thank you!! That actually makes sense!! :biggrin:

welcome!

Reply 359

Mary562

2

Original post by Krollo

I should point out -occasionally, e.g. on last year's paper, there was a question on iteration where degrees/radians was not specified. I believe the 'default' from C3 onwards in radians.

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Yes, I did that paper yday - and the answer was in radians.

Edexcel A2 C3 Mathematics 12th June 2015

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