SOLUTION: Hi! i have a question that asks to use a graphing calculator for the following equation. "Find the roots of the equation" y=.1x^3+2x^2-x-3 i dont know how to find the roots on

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Question 46953: Hi! i have a question that asks to use a graphing calculator for the following equation.
"Find the roots of the equation"
y=.1x^3+2x^2-x-3
i dont know how to find the roots on the graphing calculator can someone tell me how please?? any advice will be helpful thanks!
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
y=.1x^3+2x^2-x-3 "
Enter the equation after selecting "y=".
Select "ZOOM"
Select "Standard" to see the graph
Adjust the WINDOW by changing xmin to -25
so you can see all the graph.
Select "CALC"
Select "Zero"
Make the "Left Bound" x=-20.53
Select "Enter"
Make the "Right Bound" x=-20.15
Select "Enter"
Select "Enter" again
You should have a display that says x=-20.4178 and y=0
This is your 1st "ZERO".
--------------------------------
Select "CALC" again.
Move the cursor to x=-1.170213
Make this the "Left Bound".
Move the cursor to -.7978723 and make it the "Right Bound".
Select "Enter" twice to see the 2nd ZERO.
----------------------
Repeat the same process to find the 3rd ZERO.
Cheers,
Stan H.