(2x -5) - (5x +2)(2x -5)​= (2x-5)*1 - (5x+2)(2x-5)= (2x-5)(1 - (5x+2))= (2x-5)(1 - 5x - 2)= (2x-5)(-1 - 5x)= -2x - 10x^2 + 5 + 25x= -10x^2 + 23x +5