Question

(x-1)(x-2)+(x-2)(x+3)-2(x-3)(x-4)＞＝（大于等于）-4

Answer 1

(x-1)(x-2)+(x-2)(x+3)-2(x-3)(x-4)＞＝-4

x^2-3x+2+x^2+x-6-2(x^2-7x+12)>=-4

2x^2-2x-4-2x^2+14x-24>=-4

12x>=20

x>=5/3