Qubic equation solving.. and just bad sums

#12
by vivazko - opened

first I put Qubic equation with low values. x^3โˆ’15x^2+71xโˆ’105=0
It solved by factoring
Clipboard_05-28-2025_01.jpg
then I increased values, it used some heavy method giving failing approximate value
Clipboard_05-28-2025_02.jpg
on second try, lighter method but again failing approximate values
Clipboard_05-28-2025_04.jpg

just overthinking of multiplication when expanding (x-12721)*(x-13721) and wrong result
...
13221^2 โˆ’ 500^2 = 174804841โˆ’250000=174554841
SHOULD BE:
174794841โˆ’250000=174544841

vivazko changed discussion title from Qubic equation solving to Qubic equation solving.. and just bad sums

Sign up or log in to comment