Ok... I am soooooo lost with this.

I need to factor out to find zeros of an equation.

–x4 + 10x2 + 8x– 8 is the equation.

I don't understand.... AT ALL... how they factored out the (x+ 2) to get this:

(x+ 2)($\displaystyle -x^3+2x^2+6x-4$)

I understand "factoring out" something, but I don't understand how to factor out say... x+2

Thanks guys... this is really bothering me, and I have a test tomorrow. Definitely need to understand this concept.