Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
k*(x-1)(x)(x+1)+x=-1, x=1/2
k*(x-1)(x)(x+1)+x=-1, x=1/2
Natural Language
Math Input
Extended Keyboard