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I need to know what f(x) means and why we use it in maths? I'm really stuck.

Thanks in advance

Thanks in advance

Scroll to see replies

'function of x'

f(x) basically means y, and f'(x) means dy/dx

The x can have a value, so for example, f(x) = 2x + 1, then f(1) = 3

that is as good as I can explain it!!!

f(x) basically means y, and f'(x) means dy/dx

The x can have a value, so for example, f(x) = 2x + 1, then f(1) = 3

that is as good as I can explain it!!!

O, and f(x) is the 'range' (range and domains come in at A2 (ocr spec.))

heninacoop

(x) is the basic equation of the graph, say, x² + 4x +4.

The F is what you are doing to it, eg translating it up 2, or stretching it etc. There are equations for this but I've forgotten them!

The F is what you are doing to it, eg translating it up 2, or stretching it etc. There are equations for this but I've forgotten them!

The letter within the brackets is the variable. You can have multiple variables too, like f(x,y), H(x,y,t) or anything you like really (but not repeated letters!).

chanandler

I need to know what f(x) means and why we use it in maths? I'm really stuck.

Thanks in advance

Thanks in advance

f(x) just means a 'function' of 'x',

If f(x+4)=4x then find f(x)?

Can anyone explain how its done?

Can anyone explain how its done?

Original post by Galibmehedijami

If f(x+4)=4x then find f(x)?

Can anyone explain how its done?

Can anyone explain how its done?

I may be wrong but what you want to do is to do the reverse of the change in the input x. Eg. in this function it shows that 4 is added to the input as shown with f(x+4) but to get f(x), you do the opposite so subtract 4 to get back to the original input, x. Therefore you get f((x+4) - 4) which is f(x) as +4-4 is 0. Thus with the 4x, the x here would be substituted for (x-4) which results with 4(x-4) and if you expand that, you get 4x-16. So f(x)=4x-16.

(edited 6 years ago)

Ya me to can someone help us

But how I am still confused how does it become a 3

What do u mean by f means functions

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