You are Here: Home >< Maths

# Factorising Help watch

1. I have this equation: 3x²y+6xy²+15xy that I need to factorise but I am unsure/have forgot how to do it.

Can anyone on TSR help me please?
2. Take out xy as a factor?

Spoiler:
Show
3xy(x + 2y + 5)
3. Thank you very much, simple now I look back on it.
4. To factorise it, you need to spot a common factor (which can be a letter or a number) of each of the three terms. In this case, there are more than one of these factors. You need to take each one out of each term, and put it before the bracket encompassing the whole thing.

I'll give you a similar example to show how it's done:

Notice that there's a y in each term. If you factor this y out, you get

Also notice that, within the bracket, there's a z in each term, which can too be factored out, giving:
(notice how the z becomes a 1, rather than disappearing entirely.)
which is the fully factored version of the example, as nothing else will factor out.

Hope that helped, reckon you can do yours now?

EDIT: the thread always finishes before I have time to type my replies

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: August 30, 2008
Today on TSR

Uni realities

### University open days

• University of Lincoln
Mini Open Day at the Brayford Campus Undergraduate
Wed, 19 Dec '18
• University of East Anglia
Fri, 4 Jan '19
• Bournemouth University
Wed, 9 Jan '19
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