You are Here: Home >< Maths

Announcements Posted on
TSR's new app is coming! Sign up here to try it first >> 17-10-2016

how to you solve

lx-2l - ( lxl - 2) ???

what are the rule of adding and subtracting modulus?

I tried squaring the modulus but i don't think thats how it works.

also they ask to sketch it.....

2. (Original post by liemluji)

how to you solve

lx-2l - ( lxl - 2) ???

what are the rule of adding and subtracting modulus?

I tried squaring the modulus but i don't think thats how it works.

also they ask to sketch it.....

Are you being asked to find ? Are you also asked to sketch y = ...?
3. (Original post by SeanFM)
Are you being asked to find ? Are you also asked to sketch y = ...?
yes
4. (Original post by liemluji)
yes
For solving it, I would suggest taking cases.

For sketching it - also take cases.

By cases, I mean, ranges of values of x so that you can work out what the modulus is of x-2 and x for those regions, and how you can combine them.

For example, one case would be when . Whenever that is true, you can have an algebraic expression for x as mod(x-2) = x-2 and mod(x) = x.

The second case would be and the expression would be...

and then there are 2 more cases to consider.

Latex doesn't want to work.. sorry! \geq means greater than or equal to and \leq less than or equal to.

## 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: June 14, 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

### How does exam reform affect you?

From GCSE to A level, it's all changing

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