Question

Phân tích đa thức
6x+3-(2x-5).(2x+1)

Answer 1

`6x+3-(2x-5)(2x+1)`

`=3(2x+1)-(2x-5)(2x+1)`

`=(2x+1)(3-2x+5)`

`=(2x+1)(8-2x)`

`=2(2x+1)(4-x)`

Answer 2

\(6x+3-\left(2x-5\right)\left(2x+1\right)\)

\(=3\left(2x+1\right)-\left(2x-5\right)\left(2x+1\right)\)

\(=\left(2x+1\right)\left(3-2x+5\right)\)

\(=\left(2x+1\right)\left(8-2x\right)\)

\(=2\left(2x+1\right)\left(4-x\right)\)