/sci/ - Science & Math

>>11009766
> there are three possible sets of numbers
x*(x-1)*(x+1)=-210 only has one real root; see pic related. The other two roots are complex: 3±i√26.

Looking at the graph, you can see that x*(x-1)*(x+1)=k only has 3 real roots for a very narrow range of k. Specifically, for |k|<2/√27 ~=0.385.