You are Here: Home >< Maths

# How do you factorise this? watch

1. 2x2 - 32
2. (Original post by LeCroissant)
2x2 - 32
2(x squared - 16)
3. (Original post by LeCroissant)
2x2 - 32

2(x2-16)
4. (Original post by LeCroissant)
2x2 - 32
2 is a common factor, so take this outside the brackets:

2(x^2 - 16)

using the "difference of two squares" rule (one squared number minus another squared number), you can further simplify and factorise the expression:

= 2(x-4)(x+4)

And that's it really! hope that makes sense
5. 2 (x-4)(x+4)

Posted from TSR Mobile
6. Two times (x take 4) times (x add four)
7. (Original post by han0110)
2(x squared - 16)
(Original post by Smarties<3)
2(x2-16)
Ooooohhh I'm so stupid- I wrote that half of 32 is 18 so that's why I couldn't do it .

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: January 30, 2017
Today on TSR

### University open days

Wed, 21 Nov '18
• Buckinghamshire New University
Wed, 21 Nov '18
• Heriot-Watt University
Wed, 21 Nov '18
Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams