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gandalfwiz
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Can someone explain "domain" and "range"? (When talking about functions
 3 years ago
 3 years ago
gandalfwiz Group Title
Can someone explain "domain" and "range"? (When talking about functions
 3 years ago
 3 years ago

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Zxen Group TitleBest ResponseYou've already chosen the best response.2
"Domain" is the set of all possible inputs. Any values that don't give you a nonexistent answer (division by 0, etc) when you plug them into the function. "Range" is the set of all possible outputs. Hope this helps!
 3 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.0
could u explain a bit further... thanks :)
 3 years ago

Hero Group TitleBest ResponseYou've already chosen the best response.0
domain  the set of x "input" values of a function that produces a valid y range  the y "output" values that correspond with given set of x values
 3 years ago

Zxen Group TitleBest ResponseYou've already chosen the best response.2
Sure! What are you confused about? :)
 3 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.0
OH thanks Hero! And Zxen too:)
 3 years ago

Hero Group TitleBest ResponseYou've already chosen the best response.0
You're welcome
 3 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.0
do you have to have more than one x,y point to have a function?
 3 years ago

Hero Group TitleBest ResponseYou've already chosen the best response.0
I don't think a point by itself can represent a function....Well, I've never seen it....you would normally write f(x) normally represents some expression in terms of x, so it would have a certain amount of inputs and outputs. Can you write a point in the form of an expression? I don't think so.
 3 years ago

Zxen Group TitleBest ResponseYou've already chosen the best response.2
Nope. Most functions have more than one, but as long as each x value corresponds to one and only one yvalue, it's a function. :) Do you have a particular problem you need help with, or is this just general stuff?
 3 years ago

Hero Group TitleBest ResponseYou've already chosen the best response.0
So from my point of view, I'd say you can't represent a point as f(x). That being said, you can restrict values of x in a function.
 3 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.0
new school, new math course :P Want to see if I can do most of the problems by myself though. Those were just some terms that tripped me up.
 3 years ago

gandalfwiz Group TitleBest ResponseYou've already chosen the best response.0
logging off and returning to my books %0 Thanks guys!
 3 years ago

polpak Group TitleBest ResponseYou've already chosen the best response.0
You can have a function of only one point. A function is just a relational mapping of input values and output values where each input value is mapped to one (and only one) output value. So for example the function: \[f_1(x) = \cases{\begin{array}{ccc}4 & \text{if} & x = 1\end{array}}\] Would be an example of a function which has only one element in its domain: {1} and only one element in its range: {4}. If you were to graph this function you'd just have that one point. Since each element in the domain maps to only one element in the range, the relation satisfies the requirements of a function.
 3 years ago
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