You are Here: Home >< Maths

# C4 Differentiation Edexcel

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016

There are two k's one is K dash and then other is k.

k is defined by reference to k dash and the square root of A
they have k' as a positive constant.

they then have -k'/sqrtA times sqrt(h)

so they say that k'/sqrtA is a positive constant k, leaving -k sqrt(h)

i.e. k and k' are two different constants.
They have mentioned that

You are confusing with , both are different constants.

There are two k's one is K dash and then other is k.

k is defined by reference to k dash and the square root of A

5. (Original post by steve2005)
There are two k's one is K dash and then other is k.

k is defined by reference to k dash and the square root of A
(Original post by just george)
they have k' as a positive constant.

they then have -k'/sqrtA times sqrt(h)

so they say that k'/sqrtA is a positive constant k, leaving -k sqrt(h)

i.e. k and k' are two different constants.
(Original post by raheem94)
They have mentioned that

You are confusing with , both are different constants.

Thanks but why is k' equivalent to (-k' . A^-1/2)

Sorry i understand now thanks
6. (Original post by steve2005)
There are two k's one is K dash and then other is k.

k is defined by reference to k dash and the square root of A

thanks
7. (Original post by steve2005)
There are two k's one is K dash and then other is k.

k is defined by reference to k dash and the square root of A

Probably a typo from you.
8. (Original post by raheem94)

Probably a typo from you.
No typo.

There is nothing wrong with what I have typed.
9. (Original post by steve2005)
There are two k's one is K dash and then other is k.

k is defined by reference to k dash and the square root of A

(Original post by steve2005)
No typo.

There is nothing wrong with what I have typed.
-k

I think thats what raheem94 was trying to point out
10. (Original post by just george)
-k

I think thats what raheem94 was trying to point out
I know what he was trying to say. But what I wrote is correct because k is defined, in this case, to be negative.

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: March 17, 2012
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read here first

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams

## Groups associated with this forum:

View associated groups
Study resources

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.