How to solve
But, I couldn't find a way to combine $x^3$ into that factorization.
I then looked at Wikipedia to see how to solve a quartic. I'm not sure which method is the best one. The coefficients are pretty simple (in the form $ax^4+bx^3+cx^2+dx+e$, $a=e=1$, $b=c=0$, $d=-1$). Should I just use the general formula for quartic equations, or something else?
Also, I couldn't find a post on here talking about how to solve quartic equations. If someone finds a link to such a post then I might as well just delete this question. The only post I found that might be useful is this question but sadly there are no answers there.
EDIT: I would prefer all four solutions, real or complex.