# Thread: Function of F(X) Explanation needed.

1. ## Function of F(X) Explanation needed.

Guys i have asked this question before .. for a problem and i could not understand it. Thanks for all of those who in the last post i did about Function of X replied Something like " if you don't know it then you're paying the price for what you forgot".
To the point i got an Algebra SOL Friday, and i have mastered almost all of the Contents using a official reviewing site... Now i just don't understand question that ask me about the Function of (X)
But it seems simple can someone give me examples? ( I think i can take it from there)

2. Originally Posted by vaironxxrd
Guys i have asked this question before .. for a problem and i could not understand it. Thanks for all of those who in the last post i did about Function of X replied Something like " if you don't know it then you're paying the price for what you forgot".
To the point i got an Algebra SOL Friday, and i have mastered almost all of the Contents using a official reviewing site... Now i just don't understand question that ask me about the Function of (X)
But it seems simple can someone give me examples? ( I think i can take it from there)
f(x) is some expression where x is the independent variable and f(x) which is usually y is dependent.

3. Your question is very vague. If you are asking about the definition of function, then it is "a set of ordered pairs such that no two pairs have the same first member". Often, it is enough to write a "formula" such as " $y= x^2$" which tells us how, given the first member, to find the second member of each pair. Strictly speaking, we must also specify what numbers the "first member" (x) can be- that is, specify the "domain"- but typically that is the set of all numbers for which the formula can be calculated.

4. Originally Posted by HallsofIvy
Your question is very vague. If you are asking about the definition of function, then it is "a set of ordered pairs such that no two pairs have the same first member". Often, it is enough to write a "formula" such as " $y= x^2$" which tells us how, given the first member, to find the second member of each pair. Strictly speaking, we must also specify what numbers the "first member" (x) can be- that is, specify the "domain"- but typically that is the set of all numbers for which the formula can be calculated.

Yea because what you are saying made a little sense ... (for me)

The function f(x) = 1,200 - 50x gives the distance left to travel after driving x hours. What is f(9), the distance left to travel after driving 9 hours?

5. $f(9)=1200-50*9$

It tells you to put 9 where you see an x or some cases xs

6. Originally Posted by dwsmith
$f(9)=1200-50*9$

It tells you to put 9 where you see an x or some cases xs
Solve it and the result was 750miles.. Very easy just like a normal equation... Why do they make it so complicated

7. They didn't make it complicated, you did.

8. Originally Posted by HallsofIvy
They didn't make it complicated, you did.
oh so i guess ill just have to keep practicing.. Thanks again makes me feel real good when i do the errors