Question 296659: how do you graph f(x)=x^2-2x-9?
Found 3 solutions by checkley77, richwmiller, Fombitz:
Answer by checkley77(12844)   (Show Source):
You can put this solution on YOUR website! f(x)=x^2-2x-9 (0,-9) Y intercept.
x=(2+-sqrt[-2^2-4*1*-9])/2*1
x=(2+-sqrt[4+36)/2
x=(2+-sqrt40)/2
x=(2+-6.32456)/2
x=8.32456/2
x=4.16 ans. (4.16,0) X intercept.
x=(2-6.32456)/2
x=-4.32456/2
x=-2.16 ans. (-2.16,0) X intercept.
 (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, x^2 -2x -9).
Answer by richwmiller(17219)  (Show Source):
Answer by Fombitz(32388)  (Show Source):
You can put this solution on YOUR website! Just like every other function, create a table of x,y data points.
Choose a range, how about x from -5 to 5.
Then for each x, use the function to get y.
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Then take your next x, x=-4 and do the same.
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Then draw a line through all of the points.
The more points you have the smoother the graph will look.
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