You are Here: Home >< Maths

# maths question on functions watch

1. So the question is f(x) = 4/3+x

g(x) = 9 - 2x^2

So when i put F into g i get

4/9-2x^2 + 3 but, i need to get the plus 3 a common demonitor so i multipy it by 9 - 2x^2, but the answer is completley different to what i get where am i going wrong?
2. (Original post by SunDun111)
So the question is f(x) = 4/3+x

g(x) = 9 - 2x^2

So when i put F into g i get

4/9-2x^2 + 3 but, i need to get the plus 3 a common demonitor so i multipy it by 9 - 2x^2, but the answer is completley different to what i get where am i going wrong?
Don't understand, you're being totally ambiguous. Put up a picture.
3. (Original post by Zacken)
Don't understand, you're being totally ambiguous. Put up a picture.
Ok basically, the question is f(x) = 4 / 3 + x

g(x) = 9 - 2x^2

The answer is 2 / 6 - x^2

I just want to know how and why that is the answer, If u dont understand ill get a picture?
4. (Original post by SunDun111)
Ok basically, the question is f(x) = 4 / 3 + x

g(x) = 9 - 2x^2

The answer is 2 / 6 - x^2

I just want to know how and why that is the answer, If u dont understand ill get a picture?
means replacing every time you see an x in 4/(3 + x) (please use brackets) you replace x with g(x).

So

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: May 22, 2016
Today on TSR

### The most controversial member on TSR?

Who do you think it is...

### Uni strikes! How do they affect you?

Discussions on TSR

• Latest
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
Discussions on TSR

• Latest

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