a) 3x2 - 11x + 6
= 3x2 - 9x - 2x + 6
= 3x(x - 3) - 2(x - 3)
= (x - 3) (3x - 2)
b) 8x2 + 10x - 3
= 8x2 - 2x + 12x - 3
= 2x(4x - 1) - 3(4x - 1)
= (4x - 1) (2x - 3)
c) 8x2 - 2x - 1
= bó tay!!!
ok mk nha!!! 565464565657565878797624534534344565464513535465656756