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Your request for help is too vague for me to figure out what you need. What is it specifically that you've read so far that you do not understand?
Nobody here will know why you're stuck, until
after you explain why. We also won't know what graphing calculator you're using, until
after you tell us.
The best that I can do right now, based on no specifics from you, is to provide a website that plots polynomials. (I found it by entering keywords
equation grapher at Google.)
http://www.walterzorn.com/grapher/grapher_e.htm
Copy-and-paste the following expression into the function field at the above site. (The function field is labeled:
y = f(x) =)
0.1*x^4 + 0.3*x^3 - 23*x^2 - 23*x + 90
Fill in the other six fields with the graph boundaries and scales. I used the following values.
x runs from
-20 to
20 scale:
1
y runs from
-1500 to
500 scale:
100
Now, click the [GRAPH] button, and hover the mouse pointer over the graph to see the coordinates at that location.
If I wrote anything that you do not understand, please reply with your
specific questions.
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