If f(x)=x2−2xf(x) = x^2 - 2xf(x)=x2−2x, find f(x+h)−f(x)f(x+h) - f(x)f(x+h)−f(x).
h2+2xh−2hh^2 + 2xh - 2hh2+2xh−2h
2xh+h22xh + h^22xh+h2
h2−2hh^2 - 2hh2−2h
2x+h−22x + h - 22x+h−2