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# C3 Functions help [Edexcel Maths] watch

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.
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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.

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