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Thread: Help with Functions PLEEEEASE!

  1. #1
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    Help with Functions PLEEEEASE!

    g(x)<0, when x=/ -2 How do I calculate and what is the answer? ( it is a graph)
    Last edited by ceedee; Jan 15th 2018 at 08:51 AM.
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    Re: Help with Functions PLEEEEASE!

    Quote Originally Posted by ceedee View Post
    g(x)<0, when x=/ -2 How do I calculate and what is the answer? ( it is a graph)
    How do you calculate what? Is this the whole question?

    -Dan
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    Re: Help with Functions PLEEEEASE!

    You are supposed to make a graph from this...
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    Re: Help with Functions PLEEEEASE!

    Or rather I am suppose to do a graph from it and I have no idea how to do it...
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    Re: Help with Functions PLEEEEASE!

    Quote Originally Posted by ceedee View Post
    g(x)<0, when x=/ -2 How do I calculate and what is the answer? ( it is a graph)
    I assume that this notation means that, If $x\ne -2$ then $g(x)<0$. However it does not tell what $g(-2)=~?$.
    In other words, is $g$ a function from all real numbers? Or is it just a relation or some sort.

    I think that you ought post the exact wording of the given question.
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  6. #6
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    Re: Help with Functions PLEEEEASE!

    So you are to graph the inequality, g(x)< 0? Assuming that g(x) is a continuous function then the points where g(x)= 0 separates those where g(x)< 0 from g(x)> 0. So the first step should be to find all x such that g(x)= 0. Of course that depends strongly upon what g(x) is! And you haven't told us that. Quite often when we talk about a "graph" we are thinking of a graph of "y= f(x)" in two dimensions (an xy-coordinate system), but just "g(x)< 0", without a "y", would be on a single "number line". Again, on a number line, mark those values of x such that g(x)= 0. Choose one point in each interval between those points to see whether it satisfies g(x)> 0 or g(x)< 0.

    Of course, in all of this I am having to guess what properties g(x) has and what the question really is.
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    Re: Help with Functions PLEEEEASE!

    This is how it says : Draw the graph for a function which applies....g(x)<0, when x=/ -2
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    Re: Help with Functions PLEEEEASE!

    Yes the graph should be in two dimensions according to my exercises.
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    Re: Help with Functions PLEEEEASE!

    It's supposed to be an estimate
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    Re: Help with Functions PLEEEEASE!

    Quote Originally Posted by ceedee View Post
    This is how it says : Draw the graph for a function which applies....g(x)<0, when x=/ -2
    This graph will work.
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    Re: Help with Functions PLEEEEASE!

    Thank you
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