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- May 18th 2008, 03:45 PM #1

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## f(x) and g(x)

Kk here i am just dead tomorrow exam and i have no idea what f(x) or g(x) means please help? I am talking about graph functions, I am so getting pissed off now I searched everywhere and it doesnt say what does it stand for f(x) means quadratic equation? and g(x) means graph?

- May 18th 2008, 04:03 PM #2

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- May 18th 2008, 04:07 PM #3

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- May 18th 2008, 04:25 PM #4

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If you click on master's 2nd link, it explains it all....

g(x) is the same as f(x). That link explains it all.

See, f(x) is just another way of saying "y," in a sense. Instead of saying "y=2x+7 and x=3, find y" you can say "f(3)=2x+7" which is telling you to substitute all x's for 3's.... makes sense?

See, g(x) is just used if you have more than one of these equations in a problem. Kind of like using a different variable....

I suck at explaining, but just look at master's 2nd link. That's where I'm getting this from.

- May 19th 2008, 07:31 AM #5
I think the links masters gave were excellent. did you read through all of them?

basically f(x) means "a function of x (which we call f)", it is the same thing for g(x), it is just a function in the variable x which we named g.

remember what a function is. it is just a rule that assigns a unique output value for each input value. so for example. f(x) = x + 2 defines a function in the variable x. this function gives us the rule to get an output (the output is f(x), which we usually call "y" when graphing on Cartesian coordinates) for each input (x-value). So the rule tells us, whatever the x is, just add 2 to it and that gives you the output f(x). so it assigns each x and output value (x + 2).

so that is it. f(x) means a function or rule that assigns each input x an output f(x). hope this is not too late