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# C3 Composite Functions

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1. Hey, I'm struggling to simplify a composite function. This is for question 3 part a.
So far I have h(x)= (6/x+3) -2. How do I simplify this to give the answer -2x/x+3 (which is given to me)
Thanks
2. (Original post by mrmigme)

Hey, I'm struggling to simplify a composite function. This is for question 3 part a.
So far I have h(x)= (6/x+3) -2. How do I simplify this to give the answer -2x/x+3 (which is given to me)
Thanks
3. (Original post by EricPiphany)
I think I'm misunderstanding the basics of this topic lol. Why is it 2(x+3)/x+3 and not 2(6)/(x+3)
4. (Original post by mrmigme)
I think I'm misunderstanding the basics of this topic lol. Why is it 2(x+3)/x+3 and not 2(6)/(x+3)
Clearly, .
5. (Original post by mrmigme)
I think I'm misunderstanding the basics of this topic lol. Why is it 2(x+3)/x+3 and not 2(6)/(x+3)
You have to multiply top and bottom of fraction by the same number, which is essentially multiplying by 1.
6. (Original post by mrmigme)
I think I'm misunderstanding the basics of this topic lol. Why is it 2(x+3)/x+3 and not 2(6)/(x+3)
Do you remember how to add fractions? Like in GCSE? You'd need to make common denominators?

So to add , right?

Here it's the same thing:
7. (Original post by Zacken)
Do you remember how to add fractions? Like in GCSE? You'd need to make common denominators?

So to add , right?

Here it's the same thing:
Bloody hell I can't believe I got caught up on how to do that. Thanks a lot!
8. (Original post by mrmigme)
Bloody hell I can't believe I got caught up on how to do that. Thanks a lot!
You're very welcome!

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