You are Here: Home >< Maths

# IGCSE maths factorising question help

Announcements Posted on
Four hours left to win £100 of Amazon vouchers!! Don't miss out! Take our short survey to enter 24-10-2016
1. Hi,
Could someone help with this and explain each step? :

Thanks
2. (Original post by SuchBants)
Hi,
Could someone help with this and explain each step? :

Thanks
Hope that the attached document is enough explanation
Attached Images
3. Scan0020.pdf (86.6 KB, 24 views)
4. (Original post by maggiehodgson)
Hope that the attached document is enough explanation
I get the common factor but where does the plus 1 come from.
5. (X-1)(3x-2) = 3x^2 - 2x - 3x + 2
= 3x^2 - 5x + 2

Expand the second bracket with the all elements (?) of the first bracket seperately. What you basically do when expanding this is x (3x-2) and -1 (3x-2) and then add the products of these together.

I'm not good at explaining this but if you had another problem like (x^2-3x-2)(x-2), you would multiply x^2 (x-2) then -3x (x-2) & -2 (×-2) and add all products together to get the simplest form.

Posted from TSR Mobile
6. (Original post by SuchBants)
I get the common factor but where does the plus 1 come from.
The second term is (x-1) but this is really (x-1)times by 1

if you were to factorise 3x^2 + x it would be x(3x + 1) because x is x times 1.

Does that help?
7. (Original post by I'm_infires)
(X-1)(3x-2) = 3x^2 - 2x - 3x + 2
= 3x^2 - 5x + 2

Expand the second bracket with the all elements (?) of the first bracket seperately. What you basically do when expanding this is x (3x-2) and -1 (3x-2) and then add the products of these together.

I'm not good at explaining this but if you had another problem like (x^2-3x-2)(x-2), you would multiply x^2 (x-2) then -3x (x-2) & -2 (×-2) and add all products together to get the simplest form.

Posted from TSR Mobile
You seem to be explaining how to expand two brackets.

But that's not what the OP asked.
8. 1) factorise out (x-1):
(x-1)[3(x-1) + 1]

2) expand 2nd bracket
(x-1)(3x-3+1) = (x - 1)(3x - 2)
9. (Original post by notnek)
You seem to be explaining how to expand two brackets.

But that's not what the OP asked.
Yeah, I realised later on. It was because I couldn't see the maths question that the OP put a picture of so I thought that the pdf was the OP uploading the pic again or something but that was someone else :P

## 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: April 17, 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

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

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