Question

(4x-1)²-9x²

Answer 1

`# \text {DNamNgV}`

`(4x - 1)^2 - 9x^2`

`= (4x - 1)^2 - (3x)^2`

`= (4x - 1 - 3x)(4x - 1 + 3x)`

`= (x - 1)(7x - 1)`

___

`@` CT: `A^2 - B^2 = (A - B)(A + B)`

Answer 2

(4x-1)^2-9x^2

=(4x-1-3x)(4x-1+3x)

=(x-1)(7x-1)