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# Factorising watch

1. (Original post by Illidan2)
Simplify them? (2x-3) (2x-3) (x-1) (x-1)

2. Awesome! Thank you so much! About the thing though, it was a question in my textbook. I don't know if that means it'll come up in the exam, but it's in there. that was my fault though, I didn't mean , I meant

Edit: Ignore this. I missed the in the question.
3. (Original post by Illidan2)

Awesome! Thank you so much! About the thing though, it was a question in my textbook. I don't know if that means it'll come up in the exam, but it's in there. that was my fault though, I didn't mean , I meant

Edit: Ignore this. I missed the in the question.
You've got it

You might already know this, but any expression of the form can be factorised as ; that's called "difference of two squares" and it's useful to look out for square numbers in questions involving factorising so that you can see when you need to do that.
4. I didn't know about the difference of two squares thing, so it's very helpful that I now have knowledge of the technique. Apart from substitution and difference of two squares, are there other techniques I will need in order to factorise any given problem? (To A-Level standard, at least.)
5. (Original post by Illidan2)
I didn't know about the difference of two squares thing, so it's very helpful that I now have knowledge of the technique. Apart from substitution and difference of two squares, are there other techniques I will need in order to factorise any given problem? (To A-Level standard, at least.)
First get your quadratic into the form where or could be 0.

Next always look for a common factor that is a number e.g.

becomes much easier to factorise once you take out a factor of 6.

Then if you have something of the form where b and c are non-zero, you can factorise into two brackets using the method you've learnt.

If you have something of the form then take out a factor of (or something like ).

If you have then consider difference of two squares.

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Updated: October 4, 2017
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