You are Here: Home >< A-levels

# C3 Applications of Differentiation Watch

Announcements
1. I am stuck on Q3,4,6,7,8,9,10,11 of the questions could anyone help? I have done Q1,2 &5.
2. What exactly is it that you are unable to do?
3. Finding the coordinates mainly (found my old account hence the different username)
4. (Original post by henb99)
Finding the coordinates mainly (found my old account hence the different username)
(Original post by henbnyc)
I am stuck on Q3,4,6,7,8,9,10,11 of the questions could anyone help? I have done Q1,2 &5.
Q3 - I can't see what gradient the book shows to I'll just refer to it as . Anyway, you have so you need to find by using an appropriate differentiation rule that you should know. Set and solve for to see at what x coordinates the gradient is .

Once you have your value(s) of , plug them back through to find your y coordinates.
5. (Original post by henb99)
Finding the coordinates mainly (found my old account hence the different username)
It may be easier to differentiate if you express it in the form .
6. $\int_{1}^{x}\sum r+6!\left ( 1 \right +x )x \mapsto x^2 \leq x\sqrt{1+x^{\pi}}$

How do I solve? ^
7. (Original post by Aklaol)
$\int_{1}^{x}\sum r+6!\left ( 1 \right +x )x \mapsto x^2 \leq x\sqrt{1+x^{\pi}}$

How do I solve? ^
Create your own thread on the Maths forum and ask this. Don't hijack other threads, thanks.
8. (Original post by RDKGames)
Q3 - I can't see what gradient the book shows to I'll just refer to it as . Anyway, you have so you need to find by using an appropriate differentiation rule that you should know. Set and solve for to see at what x coordinates the gradient is .

Once you have your value(s) of , plug them back through to find your y coordinates.
I have tried this but only get one set of coordinates instead of two

When I differentiate using the quotient rule I get 1/(1+x)^2
9. (Original post by henb99)
I have tried this but only get one set of coordinates instead of two

When I differentiate using the quotient rule I get 1/(1+x)^2
That's correct. When it comes to square rooting, you should get 2 solutions because
10. (Original post by RDKGames)
That's correct. When it comes to square rooting, you should get 2 solutions because
So the gradient 1/9 is equal to 1+x^-2

-8/9=x^-2
11. (Original post by RDKGames)
Create your own thread on the Maths forum and ask this. Don't hijack other threads, thanks.
Lmao you look like a killjoy and you sure are
12. (Original post by henb99)
So the gradient 1/9 is equal to 1+x^-2

-8/9=x^-2
Nope. So then
13. (Original post by BluntBluster)
Lmao you look like a killjoy and you sure are
Oh definitely a lot of joy posting complicated maths problems on a simple A-Level thread.
14. (Original post by RDKGames)
Nope. So then
Thank you so much I know how dumb I must sound, I have worked it out correctly

For question 4, when I differentiated I got 3x(x+1)^2 which is equal to the gradient 7

after this I got stuck again, there should only be one point (P)
15. (Original post by henb99)
Thank you so much I know how dumb I must sound, I have worked it out correctly

For question 4, when I differentiated I got 3x(x+1)^2 which is equal to the gradient 7

after this I got stuck again, there should only be one point (P)
Please state the original function, they are hard to see. Is it ??? If so, check your differential again.
16. (Original post by RDKGames)
Please state the original function, they are hard to see. Is it ??? If so, check your differential again.
My bad I had a plus instead of a minus
I have got it to be (2,2)
17. (Original post by henb99)
My bad I had a plus instead of a minus
I have got it to be (2,2)
Correct.
18. (Original post by RDKGames)
Correct.
What a levels to do btec level 3 ict with

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:
Updated: September 18, 2016
Today on TSR

### Fastest and slowest uni offer senders

When will your offer come?!

### How great GCSEs turn into an unconditional offer

Discussions on TSR

• Latest
• ## 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.

• Poll
Help with your A-levels

## All the essentials

### Student life: what to expect

What it's really like going to uni

### Essay expert

Learn to write like a pro with our ultimate essay guide.

### Uni match

Our tool will help you find the perfect course for you

### Create a study plan

Get your head around what you need to do and when with the study planner tool.

### Resources by subject

Everything from mind maps to class notes.

### Degrees without fees

Discover more about degree-level apprenticeships.

### Study tips from A* students

Students who got top grades in their A-levels share their secrets

## Study help links and info

Can you help? Study help unanswered threadsRules and posting guidelines

### HEAR

Find out how a Higher Education Achievement Report can help you prove your achievements.

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## 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.

• 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.