a) 3x2 + 10x + 8
= 3x2 + 6x + 4x + 8
= 3x.(x + 2) + 4.(x + 2)
= (x + 2).(3x + 4)
b) 2x2 + x - 6
= 2x2 + 4x - 3x - 6
= 2x.(x + 2) - 3.(x + 2)
= (x + 2).(2x - 3)
a) \(\left(3x+4\right)\left(x+2\right)\)
b) \(\left(2x-3\right)\left(x+2\right)\)
a) 3x2 + 10x + 8
= 5x2 - 2x2 + 10x + 8
= (5x2 + 10x) + (-2x2 + 8)
= 5x(x + 2) - 2(x2 - 4)
= 5x(x + 2) - 2(x + 2) (x - 2)
rùi bn làm tiếp nha mk bí!! 6575685685976978454254534565654567567567567563454
a/ (3x2 + 6x) + (4x + 8) = 3x(x+2) + 4(x+2) = (x+2)(3x+4)
b/ (2x2 + 4x) - (3x + 6) = 2x(x+2) - 3(x+2) = (x+2)(2x -3)