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Thread: Domain and Range

  1. #1
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    Domain and Range

    I don't understand Domain and Range at all

    Domain and Range-img_1245.jpg

    f (x) = 2
    f (1)

    2x = 2

    x = 1 ?

    #27
    Last edited by diehardmath4; Oct 28th 2017 at 12:50 PM.
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  2. #2
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    Re: Domain and Range

    #27 requires you to interpret a function graph

    (a) f(1) = -2

    to see that, start at the origin and move right to x = 1 on the x-axis ... from there, move down until you reach the function curve. Note that you're at the point (1,-2) which means f(1) = -2.


    (b) f(x) = 2 at x = 4

    to see that, start at the origin and move up to y = 2 on the y-axis ... from there, move right until you reach the function curve. Note that you're at the point (4,2) which means f(4) = 2.
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  3. #3
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    Re: Domain and Range

    So I'm only looking for the coordinates of the curve or curves ?
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  4. #4
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    Re: Domain and Range

    Quote Originally Posted by diehardmath4 View Post
    So I'm only looking for the coordinates of the curve or curves ?
    Read the directions above the four graphs 27 thru 30...
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  5. #5
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    Re: Domain and Range

    I still don't understand question 27 or any after 27
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  6. #6
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    Re: Domain and Range

    When graphing a function, you are graphing the coordinates $\big( x,f (x)\big) $.

    So, when trying to find the value of $f (x)$ for specific values of x, follow the instructions. You are basically looking for the y-coordinate. This is one of those times in math where it is difficult to explain and easier to learn by doing. If you try many examples, hopefully it will become clear what you are doing.
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  7. #7
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    Re: Domain and Range

    Thanks from SlipEternal
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