You are Here: Home >< Maths

# C3 Functions help [Edexcel Maths]

Announcements Posted on
Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
1. I've mapped f(x) but I don't know how to map x^2 + 9, x > 4 for g(x)

Help is appreciated, thanks.
Attached Images

2. They're the exact same to graph. Now g is not a function as it is not defined for all values of x, but f is, so f is a function.
3. (Original post by B_9710)
They're the exact same to graph. Now g is not a function as it is not defined for all values of x, but f is, so f is a function.
Could you explain why g(x) is not a function in more detail, I still don't quite get it.
4. (Original post by ManLike007)
Could you explain why g(x) is not a function in more detail, I still don't quite get it.
A function must be defined for all values of x. However g is not defined at x=4 so it is not a function.
5. (Original post by B_9710)
A function must be defined for all values of x. However g is not defined at x=4 so it is not a function.
Ahh I see now, thanks for your help.

## 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: July 23, 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

### Who is getting a uni offer this half term?

Find out which unis are hot off the mark here

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