Solving cubic equations using calculator

Jul 2008
5,233
52
Western Canada
I have an OpenOffice spreadsheet that finds roots of cubic equations analytically (i.e., non-iterative). If the constant term is -3072000000, then it gives these roots:
2548.9125293076
251.08747069239
1200
If the constant term is -3072000 then it gives these roots:
2019.50107558518
0.192036876390148
1980.30688753842
Unfortunately, this can't be easily programmed into a TI-82, because the spreadsheet uses complex math operations (even if all roots are real, the calculations may have complex intermediate results), and the TI-82 can't do complex math. I believe the TI-83 can do complex math though.
 

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