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    cowboys93's Avatar
    cowboys93 Posts: 9, Reputation: 1
    New Member
     
    #1

    Jul 7, 2009, 05:45 PM
    How do i know that this table describes a function?
    Input value - |-0|1|2|1|0|
    Output Value-|-4|-2|0|2|4|

    how can I tell when anything is a function?

    Im confused of this.
    Help pleeaseee:o
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
    Ultra Member
     
    #2

    Jul 7, 2009, 05:59 PM
    A function assigns each element x of A exactly one element y of E.

    Suppose we have a circle with radius 1. It has equation

    If we plug in x=1/2, we get two different outputs.





    See? Two different results for the same input. NOT a function.

    Say we have . A parabola with vertex at (0,0).

    If we have

    This IS a function. See the difference?

    Also, if we can pass a vertical line through its graph only once, then it is a function. A circle we can pass a vertical line through twice. Not a function.

    The parabola x^2 we can only pass a vertical line through once. A function.



    Google them and you'll find lots. Here's one: http://www.themathpage.com/aprecalc/functions.htm

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