Year 12s: what will be the first way you research your future options? >>

C3 Functions Question

Hi all,
looking for some help on this question!
Any help is appreciated
Thanks
James ImageUploadedByStudent Room1473000102.951189.jpg

Posted from TSR Mobile

Reply 1

B_9710

Have you found ff(x) in terms of a and b?

Reply 2

RDKGames

Study Forum Helper

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.

Reply 3

james0902

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

Reply 4

Zacken

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

cx + d = 9x + 5

then you'd have

c=9

and

d = 5

. In this case, you have

(a^2 )x +(ab + b) = (9)x + (-28)

. So what can you get?

Reply 5

RDKGames

Study Forum Helper

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

x^1

and

x^0

because they must be equal to each other on both sides.

Reply 6

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

Reply 7

RDKGames

Study Forum Helper

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.

Quick Reply

Latest

Articles for you

How to revise for GCSE Maths: AQA explains what to do

How to revise for A-level Maths exams: AQA explains what to do

Powerful questions business students forget to ask their career advisers

How technology is transforming education

C3 Functions Question

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you