Simplify

(x-1)(2x^3+2)

FOIL - First Outer Inner Last

(x * 2x^3) (x * 2) (-1 * 2x^3) (-1 * 2)

2x^4 + 2x - 2x^3 - 2

2x^4 - 2x^3 + 2x - 2

Golden Leaf's last line - where he divided through by 2 -  would be the correct approach if we were trying to solve something set to 0.......As it is, his next-to-the last line is the correct answer.....

Fixededd :P