Bài 2
c) (6x + 3) - (2x - 5)(2x + 1) d)(3x-2)(4x-3) - (2x-3)(x-1) - 2(3x-2)(x+1)
= (2x + 1)( 3 - 2x +5) = (3x-2)(4x-3-x+1-2x-2)
= (2x + 1)( 8 - 2x) = (3x-2)(x-4)
c) (6x + 3) - (2x - 5)(2x + 1)
= (2x + 1)( 3 - 2x +5)
= (2x + 1)( 8 - 2x)
d)(3x-2)(4x-3) - (2x-3)(x-1) - 2(3x-2)(x+1)
= (3x-2)(4x-3-x+1-2x-2)
= (3x-2)(x-4)