my prof had a cubic function r^3 -4r^2 + 3r -1

& quickly wrote down the roots: (r-1)^2(r-2)

how did he do that so quickly? (he didn't write down the steps)

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- Apr 6th 2009, 07:38 PMamyu2005finding roots of cubic functions
my prof had a cubic function r^3 -4r^2 + 3r -1

& quickly wrote down the roots: (r-1)^2(r-2)

how did he do that so quickly? (he didn't write down the steps) - Apr 6th 2009, 07:44 PMJhevon
- Apr 6th 2009, 07:46 PMTheEmptySet