Simplify: 2x(x−5)−x22x(x - 5) - x^22x(x−5)−x2.
x2−10xx^2 - 10xx2−10x
2x2−10x2x^2 - 10x2x2−10x
x2+10xx^2 + 10xx2+10x
x2−5xx^2 - 5xx2−5x