You are Here: Home >< Maths

# C3 Functions Question

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016
1. Hi all,
looking for some help on this question!
Any help is appreciated
Thanks
James

Posted from TSR Mobile
2. Have you found ff(x) in terms of a and b?
3. (Original post by james0902)
Hi all,
looking for some help on this question!
Any help is appreciated
Thanks
James

Posted from TSR Mobile
Find ff(x) in terms of a and b then proceed to compare coefficients, derive some equations in terms of a and b, then solve them.
4. (Original post by RDKGames)
Find ff(x) in terms of a and b then proceed to compare coefficients, derive some equations in terms of a and b, then solve them.
I believe it's a^2x + ab + b = 9x - 28
But I don't know where to go from there

Posted from TSR Mobile
5. (Original post by james0902)
I believe it's a^2x + ab + b = 9x - 28
But I don't know where to go from there

Posted from TSR Mobile
Equate the coefficients of x and the constant term.

So if you had then you'd have and . In this case, you have . So what can you get?
6. (Original post by james0902)
I believe it's a^2x + ab + b = 9x - 28
But I don't know where to go from there

Posted from TSR Mobile
Compare the coefficients of and because they must be equal to each other on both sides.
7. Can anyone help me with equating the coeffients? I'm rusty and just don't know how to move forward with it

Posted from TSR Mobile
8. (Original post by james0902)
Can anyone help me with equating the coeffients? I'm rusty and just don't know how to move forward with it

Posted from TSR Mobile
There is literally an example above my post. Use it, it isn't a complicated technique and makes sense.

## 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
your full birthday is required
1. Oops, you need to agree to our Ts&Cs to register

Updated: September 4, 2016
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

## Make your revision easier

### 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

Can you help? Study help unanswered threads

## 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.