Find all zeros of the polynomial function P(x)=x^4 + 2 x^3 - x^2 - 2 x .
If there is more than one zero write them separated by commas.
x=
x^4 + 2x^3 - x^2 - 2x
x(x^3 + 2x^2 - x - 2)
x(x^2(x+2)-(x+2))
x(x^2-1)(x+2)
x(x-1)(x+1)(x+2)
I expect you can take it from there, yeah?