G = 2x2 - 3x +1 = 2x2 -2x -x +1 =(x-1).(2x-1)
H = -x2 + 5x - 4 = -x2 + 4x +x-4 = (x-4).(1-x)
I = x2 + 4x + 3 = x2 + 3x + x + 3 =(x+3).(x+1)
K = 2x2 + 7x + 5 = 2x2 + 2x + 5x + 5 = (x+1).(2x+5)
L = -3x2 -5x -2 = -3x2 - 3x - 2x - 2 = -3.x(x+1) - 2.(x+1) = (x+1).(-3x-2)