You are Here: Home >< Maths

# c3 notation q.. watch

1. Hey, what the hell is this supposed to mean

I am doing a functions question....i looked at the back of my back..says something about a modulus
2. The modulus function simply means any negative value becomes positive. i.e mod(-5)=5
3. (Original post by Potassium^2)
The modulus function simply means any negative value becomes positive. i.e mod(-5)=5
so it becomes plus 2?? could it be possible that they should be square brackets?
4. (Original post by Sine)
so it becomes plus 2?? could it be possible that they should be square brackets?
The result from modulus X-2 will be positive, regardless of the number used.

|-5-2| = |-7| = 7

|5-2| = |3| = 3

etc.
The result from modulus X-2 will be positive, regardless of the number used.

|-5-2| = |-7| = 7

|5-2| = |3| = 3

etc.
say you have |x-2| - 3 = 1

that would be |x-2|= 4

which would make x = 6? right
6. (Original post by Sine)
say you have |x-2| - 3 = 1

that would be |x-2|= 4

which would make x = 6? right
Yes.

But x could also be -2.

|-a| = +a

Therefore let x = -2

|-2 - 2| = |-4| = 4

LHS = RHS

Therefore x = -2 too.

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: September 28, 2010
Today on TSR

### Are you living on a tight budget at uni?

From budgets to cutbacks...

### University open days

1. University of Cambridge
Wed, 26 Sep '18
2. Norwich University of the Arts
Fri, 28 Sep '18
3. Edge Hill University
Faculty of Health and Social Care Undergraduate
Sat, 29 Sep '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

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE